You cannot stop a process by using the Taskkill.exe utility in Windows ...
Fixes an issue in which you receive an error message when you try to use the Taskkill.exe utility to stop a process in Windows 8, Windows Server 2012, Windows 7, Windows Server 2008 R2, Windows Vista, or Windows Server 2008.
List of security program cleanup and uninstall tools
Provides links to the uninstall tools and directions for many security programs.
Uninstall or remove apps and programs in Windows - Microsoft Support
There are different ways to remove apps and programs, so if you can't find the one you're looking for, you can try another location. Note that some apps and programs are built into Windows and can't be uninstalled. You can try to repair a program first, if it's just not running correctly.
Fix problems that block programs from being installed or removed
Block you from uninstalling a program through Add or Remove Programs (or Programs and Features) in Control Panel. If you're trying to remove malware, you can use Windows Security (or another antivirus tool), or you can use the Windows Malicious Software Removal tool.
Configure Startup Applications in Windows - Microsoft Support
Learn how to optimize system performance by managing startup applications in Windows.
Troubleshooting Windows unexpected restarts and stop code errors ...
Windows 11 might shut down or restart unexpectedly when a serious problem occurs, causing you to briefly see an error message, such as “Your device ran into a problem and needs to restart.” Windows 11 will then restart automatically.
Fix gaming issues with the Xbox app for Windows
Learn how to troubleshoot problems installing or running games from the Xbox app for PC.
Use the System File Checker tool to repair missing or corrupted system ...
Use the System File Checker tool to repair missing or corrupted system files. When critical Windows system files are missing or corrupted, some Windows features may stop working correctly or Windows may stop responding altogether.
Xbox Support
Xbox Support ... Xbox Support
Windows 8 and Windows Server 2012 update rollup: March 2013
Improves Wi-Fi reliability when Windows 8 devices resume from hybrid sleep. Provides consistent rendering of bold text for some Windows 8 apps when compared to earlier versions of Windows. Resolves an issue in which memory dumps are not created for MPIO boot environments.