Fix Screen Aspect Ratio issues in Windows

Error code 0xc000021a - What is it?

Error code 0xc000021a occurs when the system is unable to start or there’s a failure in critical system processes. Normally, it would take about several seconds for the system to boot and while on the startup process, error code 0xc000021a may take place to block the system to boot up. Users will get a blue screen of death (BOSD) when this error occurs. When upgrading to Windows 10, be careful; you might encounter other error messages such as error code 8007002c. 

Solution

Error Causes

There are several reasons why error code 0xc000021a occurs. It is important to have a full understanding of what caused the blue screen of death before attempting to fix the error by yourself. See below for a few common causes:

• Computer malware has infiltrated your device.

• Important files such as Winlogon.exe and Csrss.exe are damaged. Winlogon.exe file is responsible for handling the login and logout processes while Csrss.exe is a vital part of Microsoft Client or Server ‘Runtime Server Subsystem’. Once one of these files is damaged or deleted, a stop error will occur.

• When there are mismatched system files installed or system upgrading process failed or still incomplete.

• Premature unloading of Wbemprox.dll

• Newly installed third-party software is not compatible with the operating system.

• There are corrupted, outdated, or incorrectly configured device drivers.

• There’s insufficient space in the system partition. Once the system partition is full, certain errors such as error code 0xc000021a will manifest.

• Windows registry is corrupted or damaged due to a software or system change. This means there are registry entries that are not cleared after uninstalling an application.

Further Information and Manual Repair

In fixing error code 0xc000021a, you might want to try and manually do so. Manual repair methods can give users effective and efficient solutions, addressing the root problems in relation to Windows error codes. Once the manual repair method is correctly implemented, users will be able to resolve issues immediately. However, there might be instances when a Windows professional is needed. In such cases, seek help from a certified Windows expert or you might want to consider using an automated tool whenever necessary.

Method One: Convert the Drive or Partition from NTFS to GPT

In order to fix Error code 0xc000021a in Windows 10, you might need to convert the partition or drive from NTFS to GPT. See below for the procedure: 1. Shut down your device then put in the Windows installation USB key or DVD. 2. Boot your device to the USB key or DVD in UEFI mode. 3. Inside the Windows Setup, open a Command Prompt window by pressing Shift + F10. 4. Type diskpart in the Command Prompt window to open the diskpart tool. 5. Type list disk to identify which drive to reformat. 6. Select which drive to reformat by typing select disk in the command prompt. Afterward, type clean then hit Enter. Once done, type convert gpt to be able to convert the drive from NTFS to GPT. Finally, type exit and press Enter. You can now close the Command Prompt window. 7. Once the partition or drive is converted from NTFS to GPT, the user can now continue the Windows Setup installation. NOTE: Select Custom in choosing which installation type to use. The drive will then appear as a single area of unallocated space. Choose that unallocated space then select Next. At this point, Windows will now begin the installation.

Method Two: Fix System File Errors

There are times when system files get corrupted or damaged which will result in system failure. If this is the case, you can use a Windows free tool to repair corrupted or damaged system files. 1. Right-click on the Start button then selects Command Prompt (Admin) from the list to open a Command Prompt window. 2. Once the Command Prompt appears, type sfc /scannow then hit Enter. Wait until the process completes. If the process is completed and it doesn’t report any error or issues that remain unsolved, you might want to employ the next method.

Method Three: Reset Windows 10

Resetting Windows will delete all software and user accounts installed in the operating system and will reinstall a fresh Windows. 1. Boot your device using a Windows installation USB key or DVD. Select Repair your computer to locate the Troubleshoot option. Afterward, choose Reset this PC. NOTE: If the device is able to boot the system, you can reset Windows without using a Windows installation USB key or DVD. You just have to boot the device then navigate to Settings in the Start button. Choose Update & Recovery then select Recovery found on the left pane. Choose Reset this PC option then select Go back to an earlier build and Advanced startup. Select Get Started button found in the Reset this PC tab. 2. Depending on your device’s condition, you can either select Keep my files or Remove everything. Both options will remove all applications installed in the device and will revert to default settings. 3. Choose either Just remove my files or Remove files and clean the drive depending on the situation. If you choose the Remove files and clean the drive option, the procedure will take longer as it will erase all the files permanently. In this case, deleted files cannot be recovered. However, if you don’t want to remove files permanently, select Just remove my files. 4. Once you’ve decided how to reset your system, click on Next once the Warning screen appears. Afterward, choose Reset once prompted. When the process completed, click on Continue.

Method Four: Download an Automated Tool

Can’t seem to put up with the long and technical manual repair process? You can still fix this error by downloading and installing a powerful automated tool that will surely get the job done in a jiffy!

Magcore.dll Error - What is it?

Magcore.dll is a type of Dynamic Link Library. This file is associated with software developed by ArcSoft, a renowned multimedia application developer. Magcore.dll consists of small programs that help load and run software developed by ArcSoft on your system smoothly. This file virtually comes into function when you use certain audio and video features incorporated in ArcSoft programs for example ArcSoft Media converter. However, you may experience Magcore.dll error code on when this DLL file fails to run and load programs. The error may hamper your ability to access ArcSoft programs on your system and cause you a great deal of inconvenience. Magcore.dll error is often displayed in any one of the following formats:

“The file magcore.dll is missing” “MagCore.dll cannot be found” "Cannot find [PATH]magcore.dll" “This application has failed to start because MagCore.dll was not found. Reinstalling the application may fix the error.”

Solution

Error Causes

This DLL file is known to be prone to errors. MagCore.dll error occurs due to several reasons such as:

• Missing or damaged MagCore.dll file
• Hardware failure
• Viral infection
• Registry issues

If you experience MagCore.dll error on your system, it is advisable to fix it right away. Though it is not fatal, but if you don’t repair it, you may not be able to access practically all ArcSoft programs on your PC.

Further Information and Manual Repair

Here are some of the efficient and easy manual methods to resolve error MagCore.dll on your PC:

Method 1 - Scan and Remove Malware

MagCore.dll error can be triggered by viral or other malware infection. Malware can easily damage DLL files and masquerade as the MagCore.dll file. To resolve, simply download a powerful antivirus on your system. Run it to scan your entire PC for viruses and remove them right away.

Method 2 - Update the Drivers for Hardware Devices

As we mentioned above the error may be related to hardware failure too. In times like these, it is advisable to update the drivers for hardware devices. For example if you try to play a 3D video game and it fails to run showing you MagCore.dll error message, then simply try updating the drivers for your video card. Drivers can be updated in Windows by using a driver update wizard from within Device Manager.

Method 3 - Use System Restore to Undo Recent System Changes

After trying method 1 and 2, if the error code still persists, then it is opt for method 3. Use Windows System Restore utility to undo recent system changes and bring your PC to its normal previous condition before the error occurred. To restore, simply go to the start menu, type System Restore. Now click on System Restore and just pick a point in the past called a restore point to return important Windows files and settings.

Method 4 - Repair the Registry

If the underlying cause of the MagCore.dll error code is related to registry issues, then simply repair the registry. You can fix it manually but it is a little complicated and time-consuming. You may find it difficult if you are not a technical whiz. Nonetheless to resolve and repair it in seconds, download Restoro. This is a powerful and a user-friendly PC Fixer embedded with a registry cleaner and several other highly functional scanners. Run it to scan your entire PC for registry problems. The registry cleaner utility removes all bad and invalid entries, cleans up the registry space, and repairs the damaged files. Click here to download Restoro and repair MagCore.dll error code on your PC.

You can prevent starting of app installations files if they have not come from the MS store inside Windows 11. This can make your PC more secure because all apps in the store will have to be digitally signed and overall it can provide you with more control over what will be installed. Follow the guide below to find out how can you easily turn this feature ON.

1. Press ⊞ WINDOWS + I to open Windows settings
2. Select Apps and then choose Apps & Features
3. Click on Choose where to get apps to bring a drop-down menu
4. Select The Microsoft Store only (Recommended)
5. Close settings

Settings will apply changes immediately and you continue using Windows right away. With these settings turned ON if you want to install a downloaded application or run the installer you will not be able to, and message The app you’re trying to install isn’t a Microsoft-verified app will show on your screen. You can always reverse this setting by choosing Anywhere in settings instead of Microsoft store only.

Google Chrome, Microsoft Edge, Mozilla Firefox are some of the leading browsers commonly used these days and they all include an embedded copy of the Adobe Flash Player. So if you are running a Windows 10 PC then you can have up to 4 copies of Adobe Flash Player; one for Microsoft Edge, one for Internet Explorer, one for Opera, one for Firefox. You might also experience cases wherein two flash players are simultaneously running, i.e. one installed in Chrome as a single plug-in and another one installed in Windows, trying to parse the data. And in such cases, you might consider removing or uninstalling one of the versions of Adobe Flash Player. If you do, then you’ve come to the right place as this post will guide you in disabling the embedded Adobe Flash Player in Windows 10. Before you get started in removing the Adobe Flash Player in Internet Explorer & Microsoft Edge browser, you need to sign in with your administrative account even if don’t use it or set it as the default browser. After you’ve signed in to your administrative account, follow the steps below. Step 1: Open your browser, if you are using Edge then open it. Step 2: After opening your browser, go to its Settings and select Advanced Settings. Step 3: Next, Move the slider against the “Use Adobe Flash Player” option to off. Step 4: After that, open File Explorer and navigate to this address, “C:/Windows/servicingPackages” and from there, check on the following entries:

• Adobe-Flash-For-Windows-Package~31bf3856ad364e35~amd64….(version number of the Flash Player)
• Adobe-Flash-For-Windows-WOW64-Package~31bf3856ad364e35~amd64….(version number of the Flash player #)
• Adobe-Flash-For-Windows-onecoreuap-Package~31bf3856ad364e35~amd64…(version number of the Flash Player)

Step 5: Take note of all the listed package names of Adobe Flash Player and tap the Win + R keys to open the Run dialog box and type “Regedit” in the field and hit Enter to open the Registry Editor. Step 6: Next, right-click on the three keys which have the name of the packages you listed and select “Permissions” one after the other. Step 7: Then check “Allow” to enable full control for the Administrators account and click OK to save the changes made. Step 8: Select the three keys one after the other and select Visibility DWORD located on the right side and then right-click on Visibility and change the Value data from 2 to 1. Step 9: Go over the same procedures again for the other keys. Once you’ve completed then you should now be able to remove packages using the DISM tool. Step 10: Simply open an elevated Command Prompt and execute the following commands:

• dism /online /remove-package /packagename:Adobe-Flash-For-Windows-Package~31bf3856ad364e35~amd64-10.0.17134.1
• dism /online /remove-package /packagename:Adobe-Flash-For-Windows-WOW64-Package~31bf3856ad364e35~amd64-10.0.17134.1
• dism /online /remove-package /packagename:Adobe-Flash-For-Windows-onecoreuap-Package~31bf3856ad364e35~amd64-10.0.17134.1

Keep in mind that the numbers at the end could be different on your computer due to the difference of version number so you have to use the numbers on your system. After that, reboot your computer.

Disk Write Error in Steam is thrown at you while you try to download or update the game in your library. If you are an unfortunate user of Steam that has encountered this error do not sweat, the error is usually tied to permission in windows or file corruption and not to hardware issues and can be easily resolved.

In this guide, we will go through solutions for this specific error and it is advisable to go through solutions as they are presented since they go from the easiest and most common issues.

Restart PC and Steam

The easiest and quickest way of resolving this issue is just a simple restart of the Steam client. Just completely quit Steam and they run it again, if this has not solved the issue try rebooting your PC. In most cases, this can solve the issue since this error is known to be introduced with some communication issues with OS (Windows)

Set Write permissions

Disk write permissions could also cause this error because if by any chance the Steam library folder has been set or changed to the read-only client would be unable to write anything in it. To easily solve this issue completely exit the Steam client and rerun it as administrator. Just right-click on it and select Run as Administrator. If this has solved your issue run Steam always as an administrator.

To run always as an administrator right click on the steam executable, go to properties, and inside properties go to the compatibility tab. In the compatibility tab check run as administrator and click on OK.

Clear download cache

If for any reason cache has become corrupted there is a big chance that this might be an issue why there is a disk drive error in Steam. To clear download, cache goes into your client, and on top drow down menu click on steam. Find and open settings and inside go to the downloads tab. Locate a clear download cache and immediately you will be prompted to restart Steam. After restart, you will be asked to login into steam and the issue with disk write should be gone.

Repair library folder

Library folder issues can also be the source of disk write annoyance so let's repair them. Click steam in the top left and go to the settings. Locate and click on Downloads and then go to Steam library folders. You will be here shown all disk drivers you are using for steam games and all of the games that are downloaded.

Select the game you are getting errors with and click on three dots on the far right. From the menu choose the repair folder option. Take note that the more games you have installed, the more time the repair process will need.

Change download server

Sometimes the issue is not at your end at all, servers can experience problems and outrages and this can directly reflect at your end with a disk write error. If any of the previous solutions have not resolved the issue this is the next logical step to try. If the server is facing issues then changing the download server will resolve the issue at your end.

Click on settings in the top drop-down menu and then click on the Steam library folder. Find the downloads page and then click on download region, Choose another server than one nearest to your location since that's what will Steam choose by default.

Experiencing issues while using Remote Desktop connections is not uncommon. One of the issues that users encountered recently while trying to connect to their Remote Desktop network is the error saying, “Your credentials did not work, The login attempt failed”. If you are one of these users, then you’ve come to the right place as this post will walk you through fixing the problem. When facing this kind of problem, the first thing you can try before you do some troubleshooting steps is to verify the credentials. But if you are certain that you’ve entered the correct credentials just like what other users reported, then it’s completely a different matter. Based on the reports, this error is common on newly installed versions of Windows 10 or after reinstalling the operating system which could mean that the problem might be due to the Windows security policies or the username might have been recently modified. The latter case is a possibility especially if you’ve reinstalled Windows 10 and had entered a new username. In such a case, you will really have a difficult time connecting to your Remote Desktop connection since its credentials do not really automatically change. If you’ve verified that your credentials are correct, then now’s the time you troubleshoot the problem with the help of the potential fixes provided below. Just make sure that you follow each one of them in sequence.

Option 1 –Try to run the Network Adapter troubleshooter

To run the Network Troubleshooter, refer to these steps:

• Open the Search bar on your computer and type in “troubleshoot” to open the Troubleshoot settings.
• Next, scroll down and select the “Network Adapter” option from the right pane.
• Then click on the Run Troubleshooter” button.
• After that, your computer will check for any possible errors and will pinpoint the root cause of the problem if possible.
• Restart your computer.

Option 2 – Try to change the network profile from public to private

According to some reports, this error occurs on systems where the network profile was set to public. Thus, you need to change the network profile to private to resolve the problem. How? Refer to these steps:

• Go to Start and from there click on Settings > Network & Internet > Status.
• Next, click on the “Change connection properties” option.
• After that, set the radio button of Network Profile from Public to Private.
• Wait for a couple of seconds until the system is done applying the changes you’ve made and then see if you can now connect to the Remote Desktop connection.

Option 3 – Try changing the account username

As mentioned, one of the possible causes for this error is the reinstallation of the operating system. You might have changed the username for the system but it does not really change the username of the Remote Desktop connection as well. Thus, you have to change the username back to what it was before you’ve reinstalled Windows 10.

Option 4 – Try modifying the Windows Security Policy

You can also try to edit the Windows Security Policy as it could help in resolving the error. This Windows Security Policy, when enabled, will not allow non-admin users to log on to the Remote Desktop connection. So if you want to allow non-admin users to use the Remote Desktop connection, then you need to modify this policy. Note that you can only do that if you are the admin of the system yourself.

• Tap the Win + R keys to open the Run utility.
• Then type “secpol.msc” in the field and tap Enter or click OK to open the Local Security Policy.
• After opening the Local Security Policy window, select Local Policies > User Rights Agreement located on the left pane.
• Next, double click on “Allow log on through Remote Desktop Services” located in the right pane.
• And in the next window that appears, select Add user or group.
• After that, type in the username of the intended non-admin user under the “Enter the object names to select” column.
• Once done, click on the Check Names button to fix the username and then click OK to save the changes made.
• Restart your computer.

Option 5 – Use the Group Policy Editor

• Tap the Win + R keys to open the Run dialog box and then type “gpedit.msc” in the field and tap Enter to open the Group Policy Editor.
• Next, navigate to this path: Computer Configuration > Administrative Templates > System > Credentials Delegation.
• Double click on the “Allow delegating default credentials with NTLM-only server authentication” policy setting located on the right pane to edit it.
• After that, shift its radio button to Enabled and click on Show.
• Then type “TERMSRV/*” in the Value box and click OK.
• Now repeat the same for the following policy settings:
  • “Allow delegating default credentials”
  • “Allow delegating saved credentials”
  • “Allow delegating saved credentials with NTLM-only server authentication”

• Once you’re done, restart your computer and see if the problem is fixed.

A general rule of thumb, which is followed by most users, is to download the specific missing DLL file and place it within the software’s installation directory. However, this can be harmful to your system as hackers often upload popular malicious DLL files to target systems. Thus, you should avoid downloading DLLs from the internet. And follow these steps to fix the DLL error:

• Restart your computer
• System restore to an earlier state
• Run a malware/virus scan
• Update all the hardware drivers
• Running SFC /scannow command in command prompt
• Then do as the error suggests, reinstall the program if it’s feasible. Game files can take several hours to install and therefore, reinstallation can be a cumbersome job. Also, frustrating if the error appears after reinstallation.
• Update device drivers manually, such as graphics drivers, DirectX software if you see DLL missing error while running game

Mozilla Firefox has introduced a new feature known as Restart with Windows which allows the browser to automatically start when your Windows 10 computer boots. This means that if you leave the Firefox browser opened while shutting down your computer, Firefox will re-open automatically along with the tabs that were opened right before you shut down your computer. Although some users may find this feature convenient, there are others who do not approve at all as it could be a nuisance. So if you’re one of the latter, then read on as this post will show you how you can disable the Restart with Windows feature in the Firefox browser on your Windows 10 computer. Refer to the instructions laid out below to get started.

• Step 1: Open Mozilla Firefox and if it’s opened already, just open a new tab and then type the following text in the address bar:

about:config

• Step 2: After typing the text given above, hit Enter and if a prompt with a warning message pops up, simply click on the “I accept the risk!” button to proceed.
• Step 3: Next, type “Restart” in the search filter which should display the following preference in the window:

“toolkit.winRegisterApplicationRestart”

• Step 4: After that, check for the preference value and then see if it’s set to true or not. If it is set to true, then it means that the Restart with Windows feature is enabled so obviously, to disable it, you need to set its value to false.
• Step 5: Now restart your computer without closing Firefox. After restarting your computer, you should no longer see Firefox starting automatically.

The Restart with Windows feature by default is disabled for most users. On the other hand, Mozilla will have this feature enabled as the default configuration in the coming weeks so it’s best that you now know what to do when that time comes since the newer versions of Mozilla Firefox are already being shipped with the Restart with Windows feature. However, if this post did not help you, then you might want to check if the feature has been added to the Startup folder, and from there, you can disable this startup program using the Task Manager > Startup tab.

If you are trying to install or update Microsoft Edge on your Windows 10 computer but ended up getting HTTP Error 500 or Error 0x8004xxxx or 0x8007xxxx, then you’ve come to the right place as this post will help you sort this problem out. The aforementioned errors when either installing or updating the Edge browser occur due to a Network issue. There is actually a range of error codes that are associated with the network connection issue. These error codes include Error 500 or 0x80010108, 0x80040801, 0x80042193, 0x80042194, 0x800421F4, 0x800421F6, 0x800421F7, 0x800421F8, 0x80072742, 0x80072EE2, 0x80072EE7, 0x80072EFD, and 0x80072EFE. To fix them, there are several options you can try. You can try to run the Network Adapter troubleshooter or update or reset the Network Adapter as well as check and the proxy configuration.

Option 1- Try updating the Network Adapter Driver

Follow the steps below to update your Network Adapter Driver:

• Tap the Win + R keys to launch the Run window and then type in the “MSC” command and hit Enter to open the Device Manager window.
• From there, expand the list of all the network drives and update each one of them.

Note: If updating the network drivers didn’t help in fixing the problem, you can also try to uninstall the very same drivers and restart your Windows 10 PC. After that, the system itself will reinstall the drivers you just uninstalled. Alternatively, you can also download and install the drivers from the manufacturer’s website directly.

Option 2 – Run the Network Adapter troubleshooter

To run the Network Troubleshooter, refer to these steps:

• Open the Search bar on your computer and type in “troubleshoot” to open the Troubleshoot settings.
• Next, scroll down and select the “Network Adapter” option from the right pane.
• Then click on the Run Troubleshooter” button.
• After that, your computer will check for any possible errors and will pinpoint the root cause of the problem if possible.
• Restart your computer.

Option 3 – Try to reset the Network Adapter

You can also try to perform a Network Reset to resolve the problem. This will reset the entire network configuration including your IP address. To perform Network Reset, follow these steps:

• Tap the Win + I keys to open Settings.
• From there, go to the Network and Internet section.
• Next, scroll down and look for “Network Reset” under the status pane.
• After that, click on Network Reset and then on Reset now to start resetting the network configuration. Once done, check if it is able to fix the error or not.

Option 4 – Try to fix the Proxy Settings

• In the Cortana search box, search for Internet Explorer and then click on the related search result.
• After that, tap the Win + T keys on your keyboard and click on Internet Options.
• Next, navigate to the Connections tab and click on LAN Settings.
• Then click on the Advanced button and delete all the entries in the list generated in the Exceptions section. And if the Advanced button is disabled because the “Use a proxy server for your LAN (These settings will not apply to dial-up or VPN connections)” option is disabled then you are good to go. Now proceed to the next step.
• Tap the Win + X keys or right-click on the Start button and select Command Prompt (Admin) or you could also search for “cmd” in the Cortana search box and right-click on Command Prompt from the search results and select the “Run as administrator” option.
• If a User Account Control appears, click on Yes to proceed. After that, type each one of the commands listed below, and don’t forget to hit Enter after you type each one of them.
  • netsh winhttp reset proxy
  • net stop wuauserv
  • net start wuauserv

• Now restart your computer and check if the problem is fixed or not by installing or updating Microsoft Edge again.

Universal Windows Platform (UWP) applications are the modern application in the windows store that can be used in all the Window devices like Xbox, Hololens, Tablet, PC or Phone. Basically, UWP provides a common platform for every device that runs Windows 10. When attempting to login into these applications and receive this error:

Can’t sign in with a Microsoft account This program is blocked by group policy. For more information, contact your system administrator. 0x8000704ec

Then this post is for you. We will guide you on how to easily resolve issues, please follow the steps provided.

1. Local group policy editor solution

   • Press ⊞ WINDOWS + R to open the Run dialog.
   • In the Run dialog box type gpedit.msc and press ENTER to open Group Policy Editor.
   • Inside the Local Group Policy Editor, navigate to the path below:
   Computer Configuration > Windows Settings > Security Settings > Local Polices > Security Options
   • On the right pane, double-click on Accounts: Block Microsoft accounts to edit its properties.
   • Under Local Security Setting tab, click on the drop-down and select This policy is disabled.
   • Click Apply > OK to save the changes.
   • Exit Group Policy Editor.

2. Registry editor solution

   As always, it is highly recommended to make a backup of the registry editor just in case that something goes wrong.
   • Press ⊞ WINDOWS + R to open the Run dialog.
   • In the Run dialog box, type regedit and hit ENTER to open Registry Editor.
   • Navigate to the registry key path below:
   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System
   • At the location, on the right pane, identify the NoConnectedUser key. The key value might be set to either 1 or 3.
   • Now, double-click the NoConnectedUser entry to edit its properties.
   • Input 0 in the Value data field and hit Enter to save the change.