My computer hard drive begins to at maximum CPU usage (observed this using task manager). Slows my computer to a crawl. I suspect a virus or worm, etc.Since this began I installed Norton 360 to attempt to resolve. Ran a FULL Scan, this has not done a thing. In task manager I found wuauclt.exe program using alot of RAM. This is my first suspect after reading a answer by Manasa P on microsoft answers.I have fouund wauaclt.exe running in three locations:WUACLT.EXE-136D60A.pf - which runs on the path C:\windows\prefetchwuauclt.exe - on C:\windows\sytem32 (this is OK)wuauclt.exe - on C:\windows\servicepackfiles\i386I am suspicious of the first and last locations. Can anyone tell me if the 1st and last are legitimate, if not what to do? 1 person needs an answerI do too