Hello Guys. I had the problem with windows activation popup screen. I followed the how too fro, gamemaster i think, but when i rebooted, i can no longer get into windows itsefl. Before the pop up had a 0x8004fe22 Loads an error now: stop: c000021a 1.Run CMD as Admin and type this %SystemRoot%\system32\Wat\WatAdminSvc.exe /run 2.Then,this code helps in disabling the task scheduler schtasks /change /disable /tn "\Microsoft\Windows\Windows Activation Technologies\ValidationTask" && schtasks /change /disable /tn "\Microsoft\Windows\Windows Activation Technologies\ValidationTaskDeadline" 3.Next,type this to delete registry entries of KB 971033 REG DELETE "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Windows Activation Technologies" /f 4.Uninstall update for x32 dism /online /remove-package /PackageName:Microsoft-Windows-Security-WindowsActivationTechnologies-Package~31bf3856ad364e35~x86~~7.1.7600.16395 for x64 dism /online /remove-package /PackageName:Microsoft-Windows-Security-WindowsActivationTechnologies-Package~31bf3856ad364e35~amd64~~7.1.7600.163 95 5.Disable activation check to stop the nags takeown /F %WINDIR%\System32\sppcomapi.dll && icacls %WINDIR%\System32\sppcomapi.dll /deny *S-1-1-0:F 6.restart your computer..that may help resolve your problems.Hope this helps. credit to Winflp Any way to go back or to add the files that have been changed or deleted. Thanks