Fix Error Code 30088-26 in Windows 10

As in previous Windows 10, inside Windows 11 also when you press the ALT + TAB key combination you will get a preview of all running applications along with all Browser tabs so you can go through them and pick the one you want to switch to. Alto, I personally am a big fan of alt-tabbing, I must admit that I am not a big fan of having multiple browsers tabs on screen when I do press key combo. Luckily there is a very easy way to turn this feature off. Turning browsers tabs thumbnails off

1. Press ⊞ WINDOWS + I to open settings
2. Click on System in the sidebar
3. Scroll down and select Multitasking
4. Find Alt + Tab section and click on the drop-down menu
5. Pick Open Windows Only
6. Close settings

Now when you press the ALT + TAB key combination you will still see your browser but only an active tab in it instead of all tabs as different preview thumbnails.

As you know, NVIDIA is one of the topmost graphics cards used and it has been that way for several years already. And in those years, the company has managed to release the best cards on the market. However, there are still times when some things fail and don’t work as expected due to some NVIDIA driver issues. As of late, one of the issues users reported about NVIDIA drivers is that it keeps on crashing on a daily basis. It gets to the point where they aren’t able to play games anymore while some users experience lag and rendering issues. In addition, some users also reported that their computer display tends to freeze sometimes, and then things would seem to go back to normal but only for a short span of time as the crash seems to happen every 10 minutes. This can be extremely annoying as you won’t be able to use your computer properly. If you are one of these users, worry not for there are several ways you can try to resolve the problem in your Windows 10 computer. Make sure to carefully follow the options given below.

Option 1 – Try checking if the NVIDIA graphics card is enabled

Although the problem is quite massive, the fix could be as simple as enabling the NVIDIA graphics card if it turns out to be disabled. There might be some strange reason why your graphics card disables itself. Thus, the best and first option you can try is to check if the NVIDIA graphics card is enabled or not. To do so, follow these steps:

• Tap the Win + R keys to open the Run dialog box.
• Then type “devmgmt.msc” in the field and hit Enter to open the Device Manager.
• After opening the Device Manager, look for the Nvidia graphics card option among the list of device drivers. Once you found it, check if it is enabled or not. If it’s not enabled, you should see a gray arrow pointing downwards. Right-click on the card and select Enabled.
• Next, right-click on the graphics card once more and click on the Update Driver Software option and then click on the “Search automatically for updated driver software” option.

Option 2 – Try to choose Maximum Performance and disable Vsync

If the first option didn’t work out for you, then you might want to try turning off Vsync and adjust the performance to the maximum. Refer to these steps to disable Vsync and adjust performance to the maximum.

• The first thing you have to do is right-click on your desktop and select the NVIDIA Control Panel among the options.
• After opening the NVIDIA Control Panel, select Manage 3D Settings.
• After that, set Vsync to off, and then in the Power Management Mode, set it to Maximum Performance. That should fix the problem.

Option 3 – Try updating the drivers from the official site of NVIDIA

If both the first and second given options didn’t work, you can also try updating the drivers from the official NVIDIA website. And in case you don’t know the type of Nvidia graphics card that your computer is on, follow the steps below:

• Tap the Win + R keys to open the Run dialog box.
• Next type in “dxdiag” in the field and click OK or hit Enter to open the DirectX Diagnostic Tool.
• From there, you can see what type of Nvidia graphics card that your system is on.
• Take note of your graphics card information and then look for the best drivers for your operating system. Once you’ve downloaded and installed the file, restart your PC.

If you get an Error Code 15 or Error Code 16 while you are browsing the web and you notice that your access is blocked to a particular website, then read on as this post will guide you in resolving this problem. Both Error Code 15 and Error Code 16 have the same message that states, “Access Denied: This request was blocked by the security rules”. Note that the error depends on what kind of browser you are using, as well as the operating system and network that you are using. On the other hand, the fixes for this error are the same and there is a handful of them that you can check out just make sure to follow each one of them carefully.

Option 1 – Sync Date and Time

The first thing you can try is to sync the Date and Time of your computer as the wrong Date and Time settings are one of the most common causes of connection problems like Error code 15 or Error code 16. This is because of the incompatibility between the SSL Certificate validation date and the System Clock. Thus, you have to sync your System Clock. Refer to the steps below to do so.

• Right-click on the Taskbar and click on the Adjust Date and Time option.
• Next, click on the Sync Now button to synchronize the Date and Time with the Microsoft Servers.
• Now make sure that the Time Zone that’s set on the same page is correct.

Option 2 – Try to reset the affected browser

Resetting the affected browser might help in fixing Error Code 15 or Error Code 16.

Mozilla Firefox

• Open Firefox and click the icon that looks like three stacked lines located at the top-right section of the browser.
• Next, select the question mark icon from the drop-down menu.
• Then select “Troubleshooting information” from the slide-out menu.
• After that, click on the “Reset Firefox” button located at the top-right section of the newly opened web page.
• Now select “Reset Firefox” in the confirmation pop-up window that appears.

Google Chrome

• Open Google Chrome, then tap the Alt + F keys.
• After that, click on Settings.
• Next, scroll down until you see the Advanced option, once you see it, click on it.
• After clicking the Advanced option, go to the “Restore and clean up option and click on the “Restore settings to their original defaults” option to reset Google Chrome.
• Now restart Google Chrome.

Internet Explorer

• Launch Internet Explorer.
• Next, click the wrench icon for Settings.
• Then click Internet Options.
• After that, go to the Advanced tab.
• From there, click the Reset button. This will reset Internet Explorer’s settings to their default condition.
• Now click OK to save the changes made.

Option 3 – Temporarily disable Firewall and third-party antivirus

Firewall and antivirus programs are known to block files the instant it detects a threat to the system. However, there are some cases when it can also block a file even when it’s a safe one. Thus, your antivirus or firewall programs might be the reason why you can’t download anything on your Windows 10 computer. To isolate the issue, you need to temporarily disable both the Firewall and antivirus programs and then check if you can now download anything from the internet. Do not forget to enable them again as disabling them can leave your computer vulnerable to cyber threats.

Option 4 – Disable the Proxy server

You can also try to disable the Proxy server for your LAN to fix Error code 15 or Error code 16 especially if your computer was attacked by some malware or adware recently. In such cases, there is a chance that the malware or adware has changed your network settings in order to generate intrusive advertisements. Thus, you have to disable the proxy server and you can do that by following these steps:

• Tap the Win + R keys to open the Run dialog box.
• Then type “inetcpl.cpl” in the field and hit Enter to pull up the Internet Properties.
• After that, go to the Connections tab and select the LAN settings.
• From there. Uncheck the “Use a Proxy Server” option for your LAN and then make sure that the “Automatically detect settings” option is checked.
• Now click the OK and the Apply buttons.
• Restart your PC.

Note: If you are using a third-party proxy service, you have to disable it.

Option 5 – Check your VPN

If you are using a VPN application, there are times when it causes some issues like this error. If that’s the case, you can try to disable your VPN temporarily and see if the error is resolved or not and if turns out that your VPN is the culprit, you have to uninstall it and install a new one or its latest version. To uninstall it, follow the steps below.

• Tap the Win + R keys to open the Run dialog box
• Then type “appwiz.cpl” in the field and hit Enter to open the Programs and Features in Control Panel.
• From there, look for the VPN service you are using, select it and then click on Uninstall to remove it.
• After that, restart your computer and try to install the latest version of the program again. It should work now. If not, proceed to the next available option below.

Spying via some malicious app on the target phone is not a new thing but it can be very uncomfortable and even against the law in some countries.

Infecting the target phone can be done in various ways, another person can intentionally download and install applications on it, and you can install them via some phishing attacks or by an online scam. Once installed this piece of software presents a very serious invasion of privacy since it can track text messages, track phone location in real-time, record calls in real-time, eavesdrop on calls, take control of the camera and microphone, and many other applications.

Here are some common symptoms of mobile phones infected with spyware.

Symptoms of spyware

Random reboots
Slow performance
Strange text messages
Overheating
Unusual high data usage
Non-familiar apps in the app list
The fast drain of the battery
Long shutdown time
Strange interference and sounds during calls
Signs of activity during standby mode

If your phone exhibits any of these symptoms you might have a spyware app installed and running on it.

Common spy apps

There are many apps that have been designed to spy on people that can be downloaded in the app store or on Google Play today. Most of these spyware apps are aimed at parents wanting to keep an eye on and protect their children. However, these can be used by anyone in order to spy on a target person via their phone.

Below is a list of common apps that can be used to spy on you. Many spyware apps require a phone to be ‘jailbroken’ or ‘rooted’ before being installed, this is when the phone’s operating system is changed to allow the phone to become unlocked and customizable.

mSpy : An undetectable spying app for iOS devices. It can be used to read your chats, see your location, view your email, check your call history, record your keystrokes, and more.

Spyera : This app requires rooted and jail-broken iPhones to work. It can go undetected and monitors phone calls and your call history. It even allows call recording and eavesdropping on live calls.

Flexispy : Flexispy prides itself as the #1 phone monitor for parents and can monitor everything from calls to social texts.

Umobix : This powerful spyware app has a dashboard that allows users to easily monitor someone’s location, calls, texts, keystrokes, all major social media, and more. You can detect Umobix because it heats up the infected phone and greatly affects the battery life of the infected device.

Ikey Monitor : Although it requires the device to be rooted for Android or jailbroken for iPhones, this spy app captures keystrokes, passwords, and screenshots, allows for call recording and supports multiple languages.

Clevguard : Available for both iOS and Android, Clevguard allows users to track GPS and Wi-Fi locations, capture screenshots remotely, and more. Due to a recent update, the spy app drains the target phone’s battery significantly.

Remove spyware from your phone

If any of the beforementioned apps are present on your phone you need to remove them right away.

Go to your phone settings and remove the malicious applications, then download some protection suite and scan the whole phone for any other trace of software remains or other malware apps.

RAM drive is basically a hard drive made of your RAM memory. Altho this kind of drive can not and is not available to save any data when the computer is shut down its advantage is lightning fast speed since the application is installed in RAM itself, it is loading from there and executing from there. Creating this kind of drive which will use your RAM memory, well part of it can not be done natively in Windows, you will need some kind of application for this task. Luckily there is a free open source application for this kind of task. ImDisk, you can download the application here. ImDisk Toolkit is an application for managing virtual drives. It also includes a utility that allows the creation of RAM drives. Download the application and install it, make sure that you select all components on the installation selection screen. After installation is finished double click on icon labeled RamDisk Configuration. Once the application is running adjust the disk size in the box at the top of the window for your RAM drive. Click “OK” at the bottom of the window. This will create your RAM drive, which is just a virtual disk that’s assigned to your computer’s RAM. The process happens transparently, so there’s nothing you need to do. If you get a warning about shutdown settings, click on the “Shutdown Settings” button. Then unlock the settings pane with your administrator password. Finally, uncheck the checkbox next to “Turn on fast startup (recommended)” and click “Save Changes” at the bottom of the window. Your RAM drive is now ready for use. Fast Startup speeds up the process of turning on your computer by saving a system state between completely off and hibernation to your hard drive. This happens when the computer writes the contents of your RAM to a stable hard drive. As you may guess, this could mess with your RAM drive’s ability to preserve and track its data. With Fast Startup off, boots may take slightly longer, but it’s doubtful that you’ll notice much. Disabling a fast startup will satisfy the warning window, but let’s consider why. This will also allow ImDisk to save your RAM drive’s data to an image file when you shut down your computer. If you don’t, the contents of your RAM drive will be erased completely every time, with no saved image storage. It would also disable the RAM drive’s ability to load the previous content. Basically, the drive would act much more like RAM and much less like a disk. Depending on your use case, that may be disappointing or unusable. You can access and use it just like any normal hard drive. It shows up in Windows’s file explorer just like any other drive. However, a Ram drive is exponentially faster than traditional types of storage. And we mean exponentially. Whereas an SSD might offer 300 to 500 MB when reading from the disk, a RAM drive can offer more than 5000 MB, even on mediocre memory sticks.

Error 0x8004210A - What is it?

0x8004210A is a typical POP3 email error message. This error may sometimes occur when you try to check your Post Office Protocol 3 (POP3) email account. 0x8004210A error code hampers your ability to both send and receive e-mails on your Outlook account. Error 0x8004210A is displayed in any one of the following formats on your PC:

The operation timed out waiting for a response from the receiving (POP) server 0x8004210a Task 'SMTP server name - Sending and Receiving reported error' (0x8004210A): 'The operation timed out waiting for a response from the receiving (POP) server. If you continue to receive this message, contact your server administrator or Internet service provider (ISP).'

Error Causes

Error 0x8004210A occurs due to several reasons. However, some of the most common reasons include:

• Wrong port number for the POP incoming server
• Your connection to the mail server is too slow
• Incoming and outgoing emails are being scanned and stopped by an antivirus installed on your system
• The Outlook send and receive job is being blocked by Firewall
• You are sending and receiving large series of emails or large email attachments
• Registry issues

No matter what the cause of this error is, to resume email communication via Outlook and to ensure your work productivity is not affected, it is recommended that you resolve this 0x8004210A error code on your PC immediately.

Further Information and Manual Repair

To fix error 0x8004210A, here are some of the most efficient and easy manual methods that you can try:

Method 1

If the cause of the error is related to the internet connection then here’s what you need to do. Try freeing up your internet connection by closing any other online activities in progress or downloads being carried on your system.

Method 2

Try to increase your server time-out periods. To do this, go to the Outlook File menu and choose account settings. Now double click on your email account and more settings. Now click advanced and increase your server timeout period to resolve.

Method 3

If you are trying to send or receive large and heavy emails on your Outlook account, the error 0x8004210A may pop up. This happens because when transferring heavy files the email account automatically locks until the task is complete, however, if it takes more time the next Send and Receive job starts while the first one is still not complete. In such an event, the email server then times out and shows you the error. Therefore to resolve, you will have to show patience. Simply wait for the large email to be sent or received before you start sending another email.

Method 4

If the antivirus installed on your system is the reason for the error pop up, then disable it for a while until the operation is complete. Then enable it once the task is performed successfully.

Method 5

Similarly, if the Firewall installed on your system is preventing Outlook from reaching your mail server, then simply disable the Firewall to resolve.

There is no doubt that the VLC media player is one of the best kinds of media players available today. However, it is not without any issues and one of the common issues encountered by users is VLC’s inability to be updated. And when you try to update VLC, you only get an error message saying, “An error occurred while checking for updates”. This inability to update VLC can be quite a headache for many users especially the ones who are facing other issues in VLC and has to update it in order to resolve them. So how will you update VLC and fix its issues when you can’t even update it in the first place? Worry not as this post will help you out. Refer to the suggestions laid out below to resolve the issue in updating VLC.

Option 1 – Check if VLC is not being blocked by the Firewall

There are instances when the Firewall like the Windows Defender Firewall blocks VLC for some unknown reason without your knowledge. Thus, you need to allow VLC to get past the Firewall in order for you to fix the issue else you won’t be able to send out a network communication. To do that, follow the steps below.

• Tap the Windows key + I to open the Settings app.
• Then click on the Update & Security option.
• After that, click on Windows Security and click the Open Windows Defender Security Center option. This will open the Windows Defender antivirus and antimalware program.
• From there, click on Firewall & network protection.
• Next, click on Allow an app through Firewall. You should see a list of programs. Scroll down until you see VLC and make sure that all the boxes are ticked including the Public and Private ones.
• Once you’re done, restart your PC and then try updating VLC again.
• Just open VLC and select the Help menu and click on Check for Updates.

Option 2 – Try running the VLC media player as an administrator

There are programs designed for Windows 10 that won’t work fully unless some parameters are met. In most cases, starting the program as an admin should resolve the problem, thus, that’s what you have to do to try and fix the “An error occurred while checking for updates” in VLC.

• First, right-click on the VLC Media Player desktop icon and then select the “Run as administrator” option or you could also right-click on the icon and click on Properties.
• After that, click the Compatibility tab and then tick the box labeled “Run this program as an administrator”.
• Next, click the OK button and then open VLC again and try updating it. That should fix the problem.

If you have just updated your Mozilla Firefox browser as of late and you noticed that it’s showing wrong or no bookmark favicon at all, then read on as this post will provide you with potential solutions that can help you resolve the problem. The basic thing you can do to fix it is to either refresh or reset the cache for favicon and then force restart the favicon service. However, if you’ve already tried this and it didn’t work, then there are still other options you can try. You can try to rebuild the configuration file for the favicon or restart the favicon service. You could also try disabling all the add-ons on your browser or scan your computer for adware. For more details, refer to each one of the options laid out below.

Option 1 – Try to rebuild the favicon configuration file

Mozilla Firefox actually creates a file each time you bookmark a webpage and this is called “favicons.SQLite”. This file is located on your computer and for you to fix the issue in Firefox, you need to rebuild this file and in order to do that, follow these steps:

• First, you need to unhide the hidden files in your computer by enabling the “Show hidden files” option so that you’ll be able to see the hidden files in your computer.
• After that, navigate to this path: C:Usersyour_usernameAppDataLocalMozillaFirefoxProfilesyour_profile_name
• From there, you need to find the “favicons.SQLite” file and once you found it, delete it.
• Next, you have to open the Firefox browser and create the same favicon configuration file which should be automatically created.
• Now check if you can now see bookmark favicons on your Firefox browser or not.

Option 2 – Try to restart the favicon service

If the first option didn’t work, you can try to restart the favicon service instead. Restarting the favicon service can help if you do not see the correct bookmark favicon on your Firefox browser. To restart this service, follow the steps below.

• You need to first open the Firefox browser and in the address bar, type “about:config” and tap Enter.
• After that, you will see a page that displays a warning message. On that page, you need to click the “I accept the risk!” button to proceed.
• Next, using the search box on the page, look for the “devtools.chrome.enabled” option. The value for this option should be set to “False” by default.
• Double click on this option to set its value to “True”.
• Once done, go to Menu > Web Developer > Browser Console or you could also tap the Ctrl + Shift + J keys, alternatively.
• Afterwards, paste this command in the pop-up window that appears and then tap the Enter button: var fS = Components.classes["@mozilla.org/browser/favicon-service;1"] .getService(Components.interfaces.nsIFaviconService); fS.expireAllFavicons();
• Once you’re done, restart your Firefox browser to check if it fixes the problem or not.

Option 3 – Try to disable all the add-ons in Firefox

The next option you can try to fix the problem is to disable all the installed add-ons in Firefox. More often than not, add-ons can cause issues in the browser so it is possible that one of the add-ons in Firefox is causing it to show incorrect or no bookmark favicon. To resolve this problem, you have to disable all the add-ons by opening Firefox and then going to Menu > Add-ons or you could also tap the Ctrl + Shift + A keys. After that, go to the Extensions section and click on the respective Disable buttons for each one of the add-ons. Once done, restart your computer and check if you can now see the bookmark favicons or not.

Option 4 – Try scanning your computer using Windows Defender

It is possible that the bookmark favicon problem is caused by some adware in the Firefox browser so you have to scan your computer to check by using security programs like Windows Defender.

• Tap the Win + I keys to open Update & Security.
• Then click on the Windows Security option and open Windows Defender Security Center.
• Next, click on Virus & threat protection > Run a new advanced scan.
• Now make sure that Full Scan is selected from the menu and then click the Scan Now button to get started.

The ntkrnlmp.exe file is a file associated with the Windows operating system’s NT Kernel and other system processes. It is also related to the “CRITICAL PROCESS DIED” error. So if you encounter a Blue Screen of Death error that’s related to this file, then you’ve come to the right place as this post will guide you in fixing the ntkrnlmp.exe Blue Screen error. This kind of Blue Screen error might be caused by the file getting corrupted or infected with some malware. Aside from these causes, the error might also be due to the corruption and malfunction of the graphics card drivers. Before you troubleshoot the problem, you might want to try performing System Restore especially if you tend to create a System Restore point every now and then. Performing System Restore could help you resolve the ntkrnlmp.exe Stop error. 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.

If System Restore didn’t help, then proceed to the given options below.

Option 1 – Disable the C-states and EIST in the BIOS

The first thing you can do is try to disable the C-states and EIST in the BIOS. To do that, refer to the steps given below.

• Go to the BIOS and from there look for an option named CPU Configuration which can usually be found under the Advanced menu.
• Next, look for CPU Power Management and under that section, disable both the “Intel EIST” and “Intel C-state” options.
• After you disable them, save the changes you’ve made and exit the BIOS.
• Now restart your computer and check if the ntkrnlmp.exe BSOD error is now fixed.

Option 2 – Try to update, rollback or disable drivers

If the first option didn’t help in fixing the ntkrnlmp.exe Blue Screen error the next thing you can do is to roll back, or update, or disable device drivers in your computer. 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 – Configure the Driver Verifier Manager

The Driver Verifier Manager is another tool in Windows that could help you fix driver-related issues. And so if you want to fix the ntkrnlmp.exe Blue Screen error you need to use the Driver Verifier Manager:

• Type in the keyword “Verifier” in the Cortana search box to search for Verifier in Windows 10.
• After that, select the option “Create custom settings”.
• Make sure that you have checked everything except the options “DDI compliance checking” and “Randomized low resources simulation”.
• Next, select the option “Select driver names from a list” option.
• Afterward, you have to select all the drivers from any unofficial or third-party provider. To simply put it, you have to select all the drivers that are not supplied by Microsoft.
• Then click on the Finish button.
• Open Command Prompt as administrator and execute this command – verifier /querysettings
• The command you just executed will display the Driver Verifier settings so if you see any of the flags enabled boot your Windows 10 PC into Safe Mode.
• Open the Command Prompt as admin again and run this command – verifier /reset
• The command will reset the Driver Verifier. Once the process is done, restart your PC and check.

Option 4 – Run the Blue Screen Troubleshooter

The Blue Screen troubleshooter is a built-in tool in Windows 10 that helps users in fixing BSOD errors like ntkrnlmp.exe. It can be found on the Settings Troubleshooters page. To use it, refer to these steps:

• Tap the Win + I keys to open the Settings panel.
• Then go to Update & Security > Troubleshoot.
• From there, look for the option called “Blue Screen” on your right-hand side and then click the “Run the troubleshooter” button to run the Blue Screen Troubleshooter and then follow the next on-screen options. Note that you might have to boot your PC into Safe Mode.

There are a lot of home users that often get a computer that comes installed with the Windows 10 Home. And since Windows 10 Pro offers more features and utilities compared to Windows 10 Home, a lot of users also prefer to upgrade their Windows 10 Home computers to Windows 10 Pro. However, while doing so, a number of users reported that they encountered error 0xc03f6506 and they were not able to proceed with the upgrade. If you are one of these users, when you encounter error 0xc03f6506, you will see the following error message on your screen:

“The last product key you entered can’t be used on this copy of Windows (0xc03f6506).”

This particular error tends to occur when you go on to activate Windows 10 although it can also appear during the upgrade process. In such cases, you will see the following error message:

“Unable to upgrade your edition, We can’t upgrade your edition of Windows. Try upgrading your edition of Windows again. (0xc03f6506).”

To fix the Activation Error Code 0xc03f6506 in Windows 10, use the options provided below as references but before you proceed, make sure that you create a System Restore point first.

Option 1 – Try to use the Registry Editor

If you have already upgraded from Windows 10 Home to Windows 10 Pro and you’re having trouble with its Activation, then you might want to apply some registry tweaks to fix the problem. How? Refer to these steps:

• Tap the Win + R key combination to open the Run dialog box.
• Then type “Regedit” in the field and click OK or tap Enter to open the Registry Editor.
• Next, navigate to this registry key: ComputerHKEY_LOCAL_MACHINESOFTWAREMicrosoftWindows NTCurrentVersion
• From there, look for a DWORD named “EditionID” and once you found it, double click on it and change its Value data to Windows 10 Professional.
• After that, look for another DWORD named “ProductName” and double click on it to change its Value data to Windows 10 Professional.
• Once you’re done, restart your computer to apply the changes made successfully.

Option 2 – Try to use Command Prompt

If the registry tweaks you applied didn’t fix the Activation error, then you can try using Command Prompt instead. Note that you can use this option in both scenarios pointed out above.

• First, you have to insert a bootable drive of the Windows10 installer.
• Next, tap the Win + X keys and select Command Prompt (Admin) from the menu.
• After opening Command Prompt as admin, navigate to the root location of the bootable drive inside the Command Prompt command line.
• Once you’re already there, type the following command and tap Enter:

setup.exe /auto upgrade /pkey <YOUR WINDOWS 10 PRO EDITION PRODUCT KEY>

After entering the command, check if it was able to fix the Windows Upgrade or Activation error 0xc03f6506. If not, refer to the next given option below.

Option 3 – Try to disable the Network Adapter

Just like the second option, you can also use this option for both the given scenarios above.

• Tap the Win + X keys and select Network Connections from the menu.
• This will open the settings for your network and on the left side panel, click on the “Change adapter settings” link. This will open Control Panel.
• From there, click on the network your computer is connected to, and then right-click on the Network Adapter that you are using and select Disable.
• After disabling the Network Adapter, try to switch to the edition of your copy of Windows 10 again and see if the problem is now fixed and don’t forget to double click on the disabled Network Adapter to get back on the Network.