After battling Windows 7 stuck updates for a few months I think I may have found a solution.
Symptoms: Updates never complete, wuauserv service uses 100% CPU or may just stick at 25% or 50%. System may be sluggish or slow.
Start an command prompt with Admin rights. – Start, Run, CMD.exe, right-click run as administrator.
net stop wuauserv
Delete C:\Windows\SoftwareDistribution folder. Yeah, you can rename it if you like but I’ve never had a problem just deleting it as it will automatically be recreated and fill up with patches and other crap.
Before installing the patch you may need to install…
Update for Windows 7 for x64-based Systems (KB3020369) or…
Update for Windows 7 (KB3020369)
Now for the fix…
Update for Windows 7 for x64-based Systems (KB3172605)
Update for Windows 7 (KB3172605)
That should do it. Start the Windows Update in the control panel and update. All should be good… should be.
— Jon