[Windows 7] 很麻煩, windows update 100% CPU

netsvc 100% CPU in background
It should be Windows update service hang in background

Cannot run windows update, just hang for 3 hours without installing any patch
Tried to run windows update troubleshooter
http://windows.microsoft.com/en- ... date-troubleshooter
but cannot fix.

Finally give up and I reinstall Win7