PC becomes unusable every few hours for months. Reboot each time. Get tiredof it, try to fix it.Check Task Manager, sort by CPU columnSee SVCHOST.EXE using 100% CPURight click, select "Go to Service(s)"Sorted by StatusClick "Services..." in lower right hand cornerFor each service whose status is "Running", disable it then check the CPUusageDisable Windows Update service, CPU usage drops to 1%Enable Windows Update service, CPU usage goes to 100%Open Windows Update program. Click "Check for Updates"Windows update fails with "unknown error" code 8024400dClick "Get help with this error" lists "Learn how to install SP1" or"Update driver" or "Disable antivirus" or "Check a drive for errors". Veryspecific.Search the web, arrive at Microsoft Corp. Official Customer Supporthttp://windows.microsoft.com/en-US/windows7/Windows-Update-error-8024400a-8024400d-or-8024400eDownload the "Microsoft Fixit" patch and run it"An error occurred while troubleshooting: An unexpected error has occurred"Gives error code 0x80070425That error code is a generic ERROR_SERVICE_CANNOT_ACCEPT_CTRL. Read http://answers.microsoft.com/en-us/windows/forum/windows_7-windows_update/problem-with-window-update-error/7d1194ad-e184-4bea-a9bb-ce889ca534dcDownload "MicrosoftFixit.wu.RNP.135286628841517854.19.1.Run.exe"Get the error message "The service cannot accept control messages at this time"Try http://support.microsoft.com/kb/968002Download and run "MicrosoftFixit.wu.Run.exe"Get the error message "The service cannot accept control messages at this time" Download and run "MicrosoftFixit50687.msi"Get the error message "The system administrator has set policies to prevent this installation"Find http://technet.microsoft.com/en-us/library/dd441085.aspxDon't have TMG Management consoleDownload and run "MicrosoftFixit50884.msi"Get the error message "The system administrator has set policies to prevent this installation"Now I have given up and disabled Microsoft Corporation Windows 7 Professional Windows Update Service and all my problems are solved.
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