Fix Operating System Loader has no signature

As you know, Windows 10 has a complicated mechanism for Activation which helps in the verification of a genuine copy of Windows 10. However, there are times when you might encounter some errors during the activation process. One of these errors is the error code 0xc000f074. This kind of error could be due to the Key Management Service or KMS which is unreachable by the client computer or if the key used in the SLSetAuthenticationData function call is incorrect. This kind of error mostly affects surfaces on computers that are upgraded from either Windows 7 or Windows 8.1 to Windows 10. In such cases, you may encounter any of the following error messages:

“Windows is unable to reach your company’s activation service. Please connect to your corporate network. If you are connected and continue to see the error, contact your system administrator. You can also click on the error detail to find the exact error. Error code: 0xC004F074.” “Activating Windows(R), (Key hash)… Error: 0xC004F074 The Software Licensing Service reported that the computer could not be activated. No Key Management Service (KMS) could be contacted. Please see the Application Event Log for additional information.” “Error 0xC004F074, SL_E_AUTHN_MISMATCHED_KEY, The Software Licensing Service reported that the key is mismatched.”

To fix the Windows 10 Activation error 0xC004F078, you have to use the correct key for your type of Windows copy or use Command Prompt to reinstall the key or you could also try running the Activation troubleshooter.

Option 1 – Try running the Windows 10 Activation Troubleshooter

The first thing you can do to resolve the Activation error code 0xc000f074 is to run the Windows 10 Activation Troubleshooter. To do so, follow these steps:

• Go to Settings and then select Activation.
• After that, click on the Windows Activation and then troubleshoot. This will help you address most of the commonly found activation issues in Windows devices.

The Windows 10 Activation Troubleshooter will determine if your license key is a valid Windows 10 digital license for an edition that is not currently installed. If it turns out that it’s not, then the troubleshooter will show you how to install the correct edition.

Option 2 – Try to use the correct key for the type of Windows version you have

If the Windows Activation troubleshooter wasn’t able to resolve the error, then you can try using the correct key for your type of Windows version. All you have to do so is check the type of your Windows copy if it’s OEM, retail, or volume. And make sure that you have the correct, valid product key for your operating system.

Option 3 – Try to use Command Prompt to reinstall the key

• In the Start Search, type “command prompt” and right-click on Command Prompt from the search results, and then select “Run as administrator”.
• After that, execute this command to uninstall the existing key: vbs /upk
• Next, you need to install the KMS product key by executing this command: vbs /ipk <The KMS Product Key>
• Once you’re done, you will see a prompt that’ll tell you whether the operation was either successful or not.
• To active, the KMS product key online, use this command: vbs /ato
• Use this command to activate the key using the telephone: exe 4
• After you’ve activated the KMS product key, restart the Software Protection Service. You can also verify the Activation Status to check if your fix was successful or not.

Option 4 – Contact Microsoft Support for assistance

If you’re at your wits’ end in trying to upgrade your computer, you should consider contacting Microsoft Support for help as they can offer you various options that would make fixing Windows Activation error code 0xc000f074 a lot easier and faster.

It has been reported that there are systems out there with Windows 11 operating systems that do not use the whole RAM memory installed in the system. If by any chance you are one of the unfortunate users that has encountered this issue, fear not, we have a solution for you.

Run the Windows Memory Diagnostic tool

1. Press ⊞ WINDOWS + S to open the search menu
2. Type in Windows Memory Diagnostic tool
3. Click on the found app
4. Select Restart now and check for problems
5. Wait for the tool to finish

Memory Diagnostic tool is a built-in tool in Windows, it was designed to automatically find and repair memory issues and should be your first step toward resolving this issue.

Check page file

1. Press ⊞ WINDOWS + S to open the search menu
2. Type in View advanced system settings
3. Click on the search result
4. Click on settings under performance
5. Click on the Advanced tab
6. Click on Change under Virtual memory
7. Uncheck the box for Automatically manage paging file size for all drives
8. Then select the drive and check the No paging file option
9. Click on Set
10. Repeat for all drives on the system
11. Reboot the system for changes to take effect

If after reboot system still does not see and use whole available RAM, repeat this process and turn back ON paging. After you are done move to the next solution.

Modify usable RAM

1. Press ⊞ WINDOWS + S to open the search menu
2. Type in System configuration
3. Click on the search result
4. Go to the Boot tab and click on Advanced options
5. Check the box for Maximum memory
6. Enter the installed RAM on your system in the field box and click on OK
7. Confirm once again on the OK and close the System configuration window
8. Restart the system

If the provided solution has not worked, uncheck the Maximum memory checkbox and save the changes. Move to the next solution.

Change and modify the registry

1. Press ⊞ WINDOWS + R to open the run menu
2. Type in Regedit and press the OK button or hit ENTER
3. Click on YES if prompted by UAC
4. Locate the HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory
5. On the right side find and double click on the ClearPageFileAtShutdown DWORD
6. Enter 1 under Value data and click on OK to save the changes
7. Close the registry and reboot the system

Enable memory remapping inside BIOS

In order to do this fix, you will need to enter BIOS on your system. How entering BIOS is different from system to system depending on your manufacturer, especially if it is a laptop this step you will have to do alone. Go to your motherboard manufacturer or laptop manufacturer and see how to enter BIOS.

1. Enter BIOS (80% of the time this can be done by pressing DEL or F12 while the system is turned ON)
2. Locate System Agent Configuration option
3. Select Memory Remap Feature and Enable it

Your BIOS might be different from ours and you might not have the System Agent Configuration option, in this case, go through the setting and try to locate Memory Remap Feature. If this feature is missing as well move to the next step.

Rearrange RAM modules on the motherboard

Sometimes RAM memory cannot be slotted properly or just purely switching them in slots can solve the issue. Take RAM out, clean memory slots, clean motherboard connectors for them, and place them back in a different order. If by any chance none of the methods worked, then the issue might be in the hardware itself, either memory banks themselves, motherboard, power supply, etc. If this is sadly the case, you will have to locate the issue and replace the faulty part. If you are not technical enough for this adventure, the best solution is to take a PC to a computer repair shop.

This post will guide you in what to do if the DisplayLink in Windows 10 is not working. There are several users who reported that their DisplayLink device has stopped working with the Windows 20 Anniversary or the Creators update all of a sudden. According to users, this issue occurs right after they finish installing a big Windows Update like the Anniversary Update or the Creators Update or right when the DisplayLink driver is updated using Windows Update. DisplayLink is a graphics transport technology that allows users to connect to any computer that supports USB or Wi-Fi. Aside from that, it is also an excellent universal docking solution to any platform which makes it a great solution for enabling multiple displays. Thus, it can be quite annoying when DisplayLink suddenly stops working. There really is no actual error message when it happens. The only telltale sign is that all the devices that use the DisplayLink technology will also stop functioning. There could be tons of reasons why DisplayLink stopped working. It could be due to an incompatible driver, or the DisplayLink driver itself is corrupted or is connected to a USB 2.0 port. In addition, the problem could also be due to the Nvidia Share (ShadowPlay) that conflicts with DisplayLink or that the Universal Serial Bus is broken. To resolve the issue, refer to the following options laid out below.

Option 1 – Run the Hardware and Devices troubleshooter

As you know, Windows comes with a built-in tool that you can use to troubleshoot the problem with DisplayLink. You can find it in Settings > Update & Security > Troubleshoot. For further instructions, follow these steps:

• The first thing you need to do is click on Start and then on the gear-like icon to pull up the window for Settings.
• After opening Settings, look for the Update and Security option and select it.
• From there, go to the Troubleshoot option located on the left-hand side of the list.
• Next, select Hardware and Devices from the list and open the Troubleshooter and run it. Once it is doing its job, wait for it to complete the process and then restart the system.
• After the system restarts, check if the problem’s now fixed. If not, refer to the next option given below.

Option 2 – Try to uninstall DisplayLink and reconnect the docking station

If the Hardware and Device troubleshooter is of no help, you can try uninstalling DisplayLink and reconnecting the docking station. To do so, follow these steps:

• Disconnect the docking station or any other device that uses DisplayLink.
• Tap the Win + R keys to open the Run dialog box.
• Then type “cpl” and hit Enter to open Programs and Features.
• From there, look for DisplayLink, right-click on it and click Uninstall.
• After that, follow the next on-screen instructions that appear on your screen to completely remove DisplayLink from your computer.
• Once you’ve uninstalled DisplayLink, click this link to download and install DisplayLink again.
• Now reconnect the docking station as well as other devices that use DisplayLink and follow the next on-screen instructions to reinstall the required drivers in your computer.
• Restart your computer and then check if DisplayLink is now working fine or not.

Option 3 – Try using a USB 3.0 port

If you are experiencing this issue with DisplayLink with a monitor that you’re trying to connect using DisplayLink, then you have to make sure that you are using a USB 3.0 port. Based on some reports, there are certain monitors that will not work with DisplayLink while connected to a USB 2.0 port since they have insufficient power to run the monitor. Like pointed out earlier, the problem with DisplayLink might have something to do with the Nvidia ShadowPlay. This streaming feature was often reported to crash the DisplayLink monitors which is why you might want to try disabling it for a while to check if it’s really true. Once you’ve disabled Nvidia ShadowPlay, restart your computer and check if your DisplayLink monitor now works.

Option 5 – Reinstall the Universal Serial Bus controller

You can also reinstall the Universal Serial Bus controller to fix DisplayLink since a malfunctioning USB port can sometimes cause issues with DisplayLink.

• Tap the Win + R keys to open the Run dialog box.
• Then type “msc” in the field and hit Enter to open the Device Manager.
• From there, look for the Universal Serial Bus controllers and expand its drop-down menu.
• Next, right-click on every Host Controller and then click on Uninstall Device.
• After uninstalling every entry, restart your computer to force your system to reinstall the drivers you’ve just uninstalled.
• Once your computer has rebooted, wait until the drivers are reinstalled and then try opening DisplayLink again.

Option 5 – Reinstall the Universal Serial Bus controller

You can also try to perform a System Restore as it can also help you fix DisplayLink. You can do this option either by booting into Safe Mode or in System Restore. If you are already in the Advanced Startup Options, just directly select System Restore and proceed with the next steps. And if you have just booted your PC into Safe Mode, refer to the steps below.

• Tap the Win + R keys to open the Run dialog box.
• After that, type in “sysdm.cpl” in the field and tap Enter.
• Next, go to the System Protection tab then click the System Restore button. This will open a new window where you have to select your preferred System Restore point.
• After that, follow the on-screen instructions to finish the process and then restart your computer and check if the problem is fixed or not.

Location services is a built-in tool in Windows 10 is a useful tool that offers users location information even when your laptop or desktop computer does not have a GPS since it uses Wi-Fi positioning as well as your device’s IP address. However, there are instances when you might encounter some problems when using this service. One instance is when you suddenly find the toggle button for Location service greyed out. This kind of program could be due to some glitch in the system or some third-party application on your computer. Because of this problem, you won’t be able to toggle the Location service on or off and you won’t be able to make any changes in its settings. Worry not, for this post will guide you on what you can do to fix the greyed-out toggle button of Location services in Windows 10. Before you perform some troubleshooting steps, you might want to restart your computer and see if it fixes the problem. If it didn’t, then this problem is not just some minor glitch. Thus, you have to follow the potential fixes provided below to fix the problem but before you do that, make sure that you create a System Restore point first. After that, follow each one of the following options.

Option 1 – Put your PC in a Clean Boot State

The first thing you can do to resolve the problem is to put your computer in a Clean Boot State. It could be that there is a third-party program that’s preventing the toggle button from functioning. To isolate this possibility, you need to put your computer in a Clean Boot State.

• Log onto your PC as an administrator.
• Type in MSConfig in the Start Search to open the System Configuration utility.
• From there, go to the General tab and click “Selective startup”.
• Clear the “Load Startup items” check box and make sure that the “Load System Services” and “Use Original boot configuration” options are checked.
• Next, click the Services tab and select the “Hide All Microsoft Services” check box.
• Click Disable all.
• Click on Apply/OK and restart your PC. (This will put your PC into a Clean Boot State. And configure Windows to use the usual startup, just simply undo the changes.)
• Now check if you can now use the toggle button of the Location service or not.

Option 2 – Try to use the Registry Editor

If putting your computer in a Clean Boot state didn’t fix the problem, you might want to make some adjustments in the Windows Registry via Registry Editor.

• Tap the Win + R keys to open the Run utility and type “regedit” in the field and then tap Enter to open the Registry Editor.
• After that, navigate to this registry path: HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServiceslfsvcTriggerInfo
• From there, select the Key (folder) named as “3” and right-click on it, and then delete it.
• Once done, exit the Registry Editor and restart your computer.

Option 3 – Try to use the Windows Services Manager

• Tap the Win + R keys to open the Run dialog box and type “services.msc” in the field and hit Enter to open the Services Manager.
• Next, look for the “Geolocation Service” entry from the list of services.
• Once you find it, right-click on it and select Properties. This will open a new mini window.
• From there, make sure that it is “Running” and its Startup Type is set to “Automatic”.
• After that, close the Services Manager and check if the problem is now resolved.

Option 4 – Try to use the Group Policy Editor

• Tap the Win + R keys to launch Run and type “gpedit.msc” in the field and click OK to open the Group Policy Editor.
• After that, navigate to this path: Administrative TemplatesWindows ComponentsLocation and Sensors
• Next, double click on each one of the following settings and select the “Not configured” or “Disabled” option.
  • Turn off location scripting
  • Turn off location
  • Turn off sensors

• Once done, navigate to this path: Administrative TemplatesWindows ComponentsLocation and SensorsWindows Location Provider
• From there, double click on the “Turn off Windows Location Provider” policy setting and set its configuration to either “Disabled” or “Not configured”. You should see the following description of the policy setting in the window:

“This policy setting turns off the Windows Location Provider feature for this computer. If you enable this policy setting, the Windows Location Provider feature will be turned off, and all programs on this computer will not be able to use the Windows Location Provider feature. If you disable or do not configure this policy setting, all programs on this computer can use the Windows Location Provider feature.”

• Now restart your computer.

This is not the first time that Intel is trying to enter the GPU field but its adventures so far were, well let us agree not so good. All of that is hoping to be changed with the upcoming ARC GPU. The first generation of Arc graphics, code-named Alchemist and previously known as DG2, will support desktop PCs and laptops and is set to arrive in the first quarter of 2022. Alchemist will have hardware-based Ray tracing and AI-driven supersampling. This indicates that GPU is aimed to compete in the Hi-end spectrum and battle side by side with Nvidia and AMD on the market. Alchemist will also pack full DirectX 12 Ultimate support. Intel also released names for the next upcoming future generations of ARC GPUs: Battlemage, Celestial & Druid. More information about ARC products will be released later this year. “Today marks a key moment in the graphics journey we started just a few years ago. The launch of the Intel Arc brand and the reveal of future hardware generations signifies Intel’s deep and continued commitment to gamers and creators everywhere,” Roger Chandler, Intel vice president, and general manager of client graphics products and solutions.

This post will guide you in fixing high CPU, Memory, and Disk usage problems caused by NTOSKRNL.exe. NTOSKRNL stands for “NT Operating System Kernel. This file is a kernel image that is responsible for a lot of systems-based processes such as Hardware Virtualization, Process, and Memory. Aside from that, it is also the one that compresses the old pages of memory that reduces the overall amount of memory being used. If you notice that your computer is running slowly and you find that the NTOSKRNL.exe file is hogging your resources such as disk usage, CPU usage as well as memory usage, then read on as this post will guide you in fixing the problem caused by NTOSKRNL.exe. Make use of the options given below to resolve the issues caused by NTOSKRNL.exe. 1] Scan your computer for potential malware There might be a good chance that your computer might be infected with malware. And this malware might be associated with the NTOSKRNL.exe file and hence making it consume a lot of system resources. So, I would really recommend you to make sure that your Antivirus is up to date and then scan your computer with it specifically the C:/Windows/System32 folder because this is the location where the NTOSKRNL.exe file is located.

Option 1 – Put your computer in a Clean Boot State

The first thing you have to do is to put your computer in a Clean Boot State as this can help you in finding any incompatible programs that are causing the problem.

• Log onto your PC as an administrator.
• Type in MSConfig in the Start Search to open the System Configuration utility.
• From there, go to the General tab and click “Selective startup”.
• Clear the “Load Startup items” check box and make sure that the “Load System Services” and “Use Original boot configuration” options are checked.
• Next, click the Services tab and select the “Hide All Microsoft Services” check box.
• Click Disable all.
• Click on Apply/OK and restart your PC. (This will put your PC into a Clean Boot State. And configure Windows to use the usual startup, just simply undo the changes.)
• From there, start to isolate the problem by checking which one of the programs you installed recently is the root cause of the problem.

Once you’ve found any incompatible programs, you need to uninstall them. Refer to the steps below to do so.

• In the search box, type in “control” and then click on Control Panel (desktop app) among the search results.
• After that, select Programs and Features from the list which will give you a list of all the programs installed on your computer.
• From there, look for the concerned program and select it and then uninstall it.

Note: If you have downloaded the app from the Windows Store, you can simply right-click on it from the application list and then uninstall it.

Option 2 – Update or rollback drivers

If the first option didn’t work for you, then it’s time to either update or roll back the device drivers. It is most likely that after you updated your Windows computer that your driver also needs a refresh. On the other hand, if you have just updated your device drivers then you need to roll back the drivers to their previous versions. Whichever applies to you, refer to the steps below.

• Open the Devices Manager from the Win X Menu.
• Then locate the device drivers and right-click on them to open the Properties.
• After that, switch to the Driver tab and click on the Uninstall Device button.
• Follow the screen option to completely uninstall it.
• Finally, restart your computer. It will just reinstall the device drivers automatically.

Note: You can install a dedicated driver on your computer in case you have it or you could also look for it directly from the website of the manufacturer.

Option 3 – Try to run the DISM tool

If the first two options didn’t work, then running the Deployment Imaging and Servicing Management might. Using this built-in tool, you have various options such as the “/ScanHealth”, “/CheckHealth”, and “/RestoreHealth”.

• Open the Command Prompt with admin privileges.
• Then type in the following commands and make sure to hit Enter right after you type each one of them:
  • Dism /Online /Cleanup-Image /CheckHealth
  • Dism /Online /Cleanup-Image /ScanHealth
  • exe /Online /Cleanup-image /Restorehealth
• Do not close the window if the process takes a while as it will probably take a few minutes to finish.

Option 4 – Try to stop the Runtime Broker process

The RuntimeBroker.exe or the Runtime Broker process is the one that monitors access to Windows APIs to make sure that the apps do not violate the core security of Windows. This process usually leaves a very small footprint. However, there are times when it consumes more resources than it’s supposed to and does not release memory after the work is done that results in a memory leak. As a result, it affects NTOSKRNL.exe which is why you have to stop the Runtime Broker process. To do so, refer to these steps:

• Tap the Ctrl + Shift + Esc to open the Task Manager.
• After opening Task Manager, go to the Processes tab and look for the Runtime Broker process.
• Once you find it, check if it is using more than 15% of your memory. If it is, then you most likely have an issue with an app installed on your computer.
• Select the Runtime Broker process and right-click on it and then click on the End Task option to end its process.

Option 5 – Try to run the Performance Troubleshooter

• Tap the Win + R keys to open the Run dialog box.
• Type “msdt.exe /id PerformanceDiagnostic” in the field and hit Enter to open the Performance troubleshooter.
• Then click on Next to get started. Wait until the process is completed.

Option 6 – Try using the Windows Performance Toolkit

You can also use the Windows Performance Toolkit in finding the root cause of the problem. Just refer to the following steps to use this toolkit.

• Search for “cmd” in the Cortana Search box and click on Command Prompt from the search results to open it.
• Next, type in the command given below or copy and paste it and then hit Enter:

xperf -on latency -stackwalk profile -buffersize 1024 -MaxFile 256 -FileMode Circular && timeout -1 && xperf -d cpuusage.etl

• After executing the command, wait for at least 60 seconds and then check the logs of the Windows Performance toolkit which is stored in a file named cpuusage.etl in the folder located at C:/Windows/System32. From there, you should see a list of all the causes of the System Resources being hogged.

Pinned Windows 10 Taskbar Items. One of the most used interfaces in the Windows environment is the Taskbar. It is where users like to pin their most-used programs as well as shortcuts with extra privileges and automated tasks. In fact, it’s a lot better than the Start Menu. So if any Windows Update messes up with your computer, or if you’ve just switched to a different computer, setting up the Taskbar with the very same set of programs you used to have is definitely not an easy task. But worry not as this post will guide you on how you can backup and restore the items on your Taskbar either manually or automatically.

Manual Backup:

• Tap the Win + R keys to open the Run prompt.
• Then type “%AppData%MicrosoftInternet ExplorerQuick LaunchUser PinnedTaskBar” in the field and hit Enter to open the folder where you can see all the shortcuts or pinned items in the Taskbar.
• After that, copy all the files in the folder and paste them somewhere else as a backup. For instance, E:\Pinned Items Backuppinnedshortcuts.
• Next, tap the Win + R keys to open the Run prompt once more, and then type “Regedit” in the field and hit Enter to open the Registry Editor. When the User Account Control dialog box appears, click Yes.
• After opening the Registry Editor, navigate to this key – HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersionExplorerTaskband
• Then right-click on the Taskbar folder and select Export.
• Now save the file with the .reg extension to another location like the E:\Pinned Items Backup folder and then name it.
• Close the Registry Editor.

Manual Restore:

Make sure to copy all the files to one of the drives if you are using another computer and then refer to the following steps.

• Tap the Win + R keys to open the Run prompt.
• Then type “%AppData%MicrosoftInternet ExplorerQuick LaunchUser PinnedTaskBar” in the field and hit Enter to open the same folder where you just copied all the shortcuts. Make sure to keep it open.
• Then open the backup folder where you saved all the pinned items and copy all the files there.
• Next, go to the Taskbar folder (%AppData%MicrosoftInternet ExplorerQuick LaunchUser PinnedTaskBar) and then paste your files in there. If you encounter a problem while doing so, just replace it with your own set of files.
• After that, go to E:\Pinned Items Backuppinnedshortcuts and then double click on tb-pinned-items.reg. If a User Account Control prompt appears, click Yes. This will add the registry file into the main registry hub. You will also get a dialog box that will confirm that data has been added to the registry successfully. Click OK.
• You should now see the items on the Taskbar. You have to restart Windows Explorer. To do so, end its process in the Task Manager.

Automatic Backup:

Backing up and restoring the pinned Taskbar items in your Windows 10 computer can be done automatically as well. But before you get started on the process, you need to understand what’s going on behind the hood first. First, you need to create two bat files and name them “Backup Pinned Taskbar Items” and “Restore Pinned Taskbar Items”. After you have that covered, refer to the following steps:

• Open the Notepad app and paste the following details and save it as “Backup Pinned Taskbar Items.bat.

REG EXPORT HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersionExplorerTaskband “E:\Pinned Items Backuptb-pinned-items.reg” xcopy “%AppData%MicrosoftInternet ExplorerQuick LaunchUser PinnedTaskBar” “E:\Pinned Items Backuppinnedshortcuts” /E /C /H /R /K /Y

• After that, run the newly created bat file with admin privileges.

Automatic Restore:

• Open the Notepad app and paste the following details and save it as “Restore Pinned Taskbar Items.bat”.

REGEDIT /S “E:Pinned Items Backuptb-pinned-items.reg” xcopy “E:Pinned Items Backuppinnedshortcuts” “%AppData%MicrosoftInternet ExplorerQuick LaunchUser PinnedTaskBar” /E /C /H /R /K /Y

• After that, run the bat file with admin privileges.

Note: Just so you know, there is a drawback to this process as we’ve noticed that any pinned apps that were downloaded from the Windows Store don’t appear in these places and any items downloaded and installed separately from the internet and then pinned.

What is 0x0000007B Error?

0x0000007B is the most common Windows stop error. The error is displayed on the blue-colored screen which is also called the blue screen of death. You may receive a 0x0000007B error message during Windows XP setup or while running the setup program. The message is often displayed as ‘a problem has been detected and Windows has been shut down to prevent damages’ or ‘inaccessible boot device error’.

Solution

Error Causes

The 0x0000007B error code is usually triggered by:

• Poor Window XP installation
• Registry corruption
• Device Drivers Issues
• Boot sector viruses

Further Information and Manual Repair

The 0x0000007B error makes your system vulnerable and reduces its speed significantly. And besides, you can’t run the programs smoothly on your PC either. Therefore, it’s advisable to fix the error right away. To fix and repair the 0x0000007B error successfully, you must first understand the cause of the error. Let’s take a look at all the solutions available to fix the 0x0000007B error.

Cause: Boot Sector Viruses

Solution: If your computer is infected with boot sector viruses, then you will first have to download a powerful antivirus. After downloading the antivirus program, run it on your PC to check your computer for viruses. Delete the viruses found and click the repair option. Sometimes even an antivirus program may fail to remove the virus and repair the system. In such cases, you must repartition and format your hard disk and also reinstall Windows XP.

Cause: Device Driver Issues

Solution: Device driver issues may occur if the boot controller is not properly configured or the driver is not up to date. If device driver configuration is the cause of the 0x0000007B error on your PC, then all you need to do is restart your PC, and while restarting press F8 to go to the advanced boot options. Now choose the ‘Last Known Good Configuration’ option. After selecting it, boot into windows and then perform a system restore. Now go to Device Manager and perform a driver rollback to reinstall the drivers. This will resolve the configuration issues. However, if you need an updated driver, all you need to do go on the web and download software to update the driver. It is advisable to download software from the manufacturer’s website in order to successfully update the device driver.

Cause: Poor Windows Installation

Solution: In this case, you will have to perform a Windows start-up repair. To do this: boot Windows XP from CD. Press ‘enter’ at setup Windows Screen when prompted. Then press R to repair Windows Installation. This procedure will not delete any user data and files. In fact, it will copy only the original Windows files over the bad or existing ones. Some of the best ways to avoid Ox0000007B blue screen errors are

• To scan for viruses every time you use your PC
• Never open web pages, emails, or download content that you think looks suspicious because that’s probably a virus.
• Always keep your computer updated.

Error Code 0x801901F7 – What is it?

Error code 0x801901F7, also known as “The Server Stumbled” error because it shows a message saying “The Server Stumbled. We all have bad days” is associated with Windows Store. Server Stumbled Error 0x801901F7 is an error related to the MS server. The error occurs due to damaged registry files, malware, virus, and corrupted data. You should fix this error to prevent a system crash or a BSOD error. There are some things you can do to fix it. These are not so complex. So, anyone can try these methods to fix error 0x801901F7. Common Symptoms for error 0x801901F7:

• Problems with Windows startup
• System becomes very slow or the system freezes
• Blue screen of death appears
• Windows fails to start some process due to Stop error code 0x801901f7

Solution

Error Causes

• This error is generally caused by corrupt registry files.
• Virus infection can cause this problem.
• Outdated driver, missing .DLL files may also cause this error.
• Microsoft server overload may cause this problem as well.
• Incorrect configuration may cause this problem.

Further Information and Manual Repair

To fix error 0x801901f7, there are four methods listed below. Some might work for you and some might not. Please try all of them to fix this error.

Method 1:

Basic method to fix error code 0x801901F7: Resetting Windows Store Cache Most of the time clearing or resetting the cache helps. It doesn't always work, but you should try this first before moving on to some advanced methods which are mentioned below. To reset the Windows Store cache please follow the simple steps below

• Open RUN by searching or pressing "Windows Key + R"
• Type "wsreset.exe" and press Enter or click on OK.
• Windows Store will open automatically along with a command prompt.
• This will reset Windows Store and you might see it loading as it should.

This method might work but if it fails to solve Error 0x801901F7 then follow the method below.

Method 2:

Advanced method of fixing error code 0x801901F7: Deleting Windows Store database file. By using this method, you will be deleting the database file for Windows Store. This file is located on your C drive or the drive where you installed your Operating System. Follow the steps below.

1. Navigate to C:WindowsSoftwareDistributionDataStoreDataStore.edb.
2. Delete DataStore.edb file from there.
3. Now Open Windows Store and see if you still get error code 0x801901F7.

The Datastore.edb file that you deleted will be automatically created once you perform Step 3 which is launching Windows Store. If you still cannot get this error away then Close Windows Store and Reboot your PC then Launch Windows Store Again.

Method 3:

Modifying Windows update properties: Perform the steps below only if the above-mentioned methods fail. You will be tweaking a few things in the Windows update to see if it helps.

1. Open Task Manager by right-clicking on Taskbar, then click on Task Manager.
2. Go to Services Tab. Click on Open Services at the very bottom of the Window.
3. Now a new window will pop up. Scroll down & find "Windows Update" from the list.
4. Double click on Windows update to open up its Properties.
5. Now from the Startup Type drop-down list, select Automatic. Click on Apply, Start, and then Ok.

Now you need to perform just one more step. Reset Windows Store again (Refer to method 1 for Steps). This should fix your Windows Store error that shows The Server Stumbled with 0x801901F7 Error Code.

Method 4: 

If the error is due to a problem with a driver, then follow the method below to uninstall the current driver:

1. Open the Run command and type “sysdm.cpl” in the text box.
2. Click Enter.
3. Open the Hardware tab on the system properties dialog box.
4. Then press on Device Manager.
5. Double press on Device type and then press on the hardware device that is reporting error code 0x801901F7.
6. Go to the Driver tab and press on Uninstall button to uninstall the device driver completely.
7. Now, install the new driver on your computer.
8. Restart your computer.
9. Run virus scan of your PC
10. Try using a different USB port.

If you do not possess the technical expertise required to accomplish this yourself or do not feel comfortable doing so, download and install a powerful automated tool to get the job done.

What is Search.schooldozer.com? And how does it function?

Search.schooldozer.com is a browser extension that functions as a search engine. It is developed and maintained by “Schooldozer”. It claims to improve users’ browsing experience by providing them with improved search results. However, it does not really do the things it claims to do. In fact, they’re quite the opposite ones – instead of improving the browsing experience, it makes users’ browsing experience unsafe and full of sponsored content. This is in contrast to what it states in its Privacy Policy:

“Install applications the easy way and without the hassle, using the Schooldozer downloader. The Schooldozer platform stems from years of experience with installing applications, resulting in a highly optimized process, yielding faster downloads, better user experience, and more successful installations.”

In addition, once installed Search.schooldozer.com is installed, it will change the default settings of a browser such as the default search engine, homepage, and new tab page. This is why security experts regard this browser extension as a browser hijacker and a potentially unwanted program. The modification of the browser's settings allows it to control users’ browsing by redirecting them to sponsored sites as well as deliver sponsored content from its affiliated sites in order to gain profit via pay-per-click marketing. And if you think that the ads it displays are harmless, think again for some of these ads can redirect you to suspicious websites that might contain harmful content. What’s more is that this browser hijacker can also keep track and monitor all your browsing activities in order to obtain your browsing data like search queries, what sites you always visit, browsing history, browser type, OS version, and so on. The information collected is then used and may even be shared with its affiliated third parties to deliver more customized and personalized advertisements.

How is Search.schooldozer.com distributed over the web?

Like a typical browser hijacker, Search.schooldozer.com is distributed using the software bundling method where several unknown and unwanted programs are bundled in a software package. Thus when you install any software bundle, make sure to always opt for the Custom or Advanced installation setup rather than the quick setup to avoid installing unwanted programs like Search.schooldozer.com. To remove Search.schooldozer.com from your computer, follow the removal guide below carefully. Step 1: Start the removal process by closing all the browsers infected with Search.schooldozer.com. If you’re having a hard time closing them, you can close them using the Task Manager just tap on Ctrl + Shift + Esc. Step 2: After you open the Task Manager, go to the Processes tab and look for the infected browser’s process and end it. Step 3: Then close the Task Manager and tap the Win + R keys to open Run and then type in appwiz.cpl to open Programs & Features in Control Panel. Step 4: From there, look for Search.schooldozer.com or any unfamiliar program that could be related to it under the list of installed programs and once you’ve found it, uninstall it. Step 5: Edit your Hosts File.

• Tap the Win + R keys to open then type in %WinDir% and then click OK.
• Go to System32/drivers/etc.
• Open the host file using Notepad.
• Delete all the entries that contain Search.schooldozer.com.
• After that, save the changes you’ve made and close the file.

Step 6: Reset all your browsers to default to their default state.

Google Chrome

1. Launch Google Chrome, press Alt + F, move to More tools, and click Extensions.
2. Look for Search.schooldozer.com or any other unwanted add-ons, click the Recycle Bin button, and choose Remove.
3. Restart Google Chrome, then tap Alt + F, and select Settings.
4. Navigate to the On Startup section at the bottom.
5. Select “Open a specific page or set of pages”.
6. Click the More actions button next to the hijacker and click Remove.

Mozilla Firefox

1. Open the browser and tap Ctrl + Shift + A to access the Add-ons Manager.
2. In the Extensions, menu Remove the unwanted extension.
3. Restart the browser and tap keys Alt + T.
4. Select Options and then move to the General menu.
5. Overwrite the URL in the Home Page section and then restart the browser.

Internet Explorer

1. Launch Internet Explorer.
2. Tap Alt + T and select Internet options.
3. Click the General tab and then overwrite the URL under the homepage section.
4. Click OK to save the changes.

Step 7: Hold down Windows + E keys simultaneously to open File Explorer. Step 8: Navigate to the following directories and look for suspicious files associated to the browser hijacker such as the software bundle it came with and delete it/them.

• %USERPROFILE%Downloads
• %USERPROFILE%Desktop
• %TEMP%

Step 9: Close the File Explorer. Step 10: Empty the contents of Recycle Bin.