I have a Lenovo T60, with Windows 7 Ultimate. The PC was slow, and I noticed that there was Windows update service using 100% CPU in Task manager. Stopping the service returned my PC to normal. No error message in Event viewer. The PC il clear, no virus/malware ecc. (Symantec Endpoint Protection 12). The same occurred with SEP shut down.
So, I tried common fixes https://support.microsoft.com/it-it/kb/971058 (found the error code 0x80070005 not fixed), then http://windows.microsoft.com/en-us/windows/troubleshoot-problems-installing-updates#1TC=windows-7 and finally a sort of handmade fix running a batch file to reset the Windows update (stopping services, unregistering then re-registering some objects etc).
Someone from Microsft suggested a new, fresh install of Windows 7. A very drastic solution.
I had the same problem about 2 years ago, when I had a PC running Windows XP: suddenly, Windows Update didn't worked, and PC was at 100% CPU; a lot of fixes, but no result - so finally I decided to change OS, bought a SSD and did a fresh install of Windows 7. Now another time the same bug !
Looking around, it seems that other people have the same problem, and that this random occurs in various Windows versions...
Any suggestion ?
Thanks from Enrico
PS sorry for my English
Edited by Chicchio, 17 July 2015 - 02:02 AM.