explorer.exe using 100% cpu!!!!

i have;
Acer aspire m1641 (2.6ghz)
3gb ram
640gb hdd
Windows vista (basic i think)


since about a week ago explorer.exe has been using from about 70% to 100% of the cpu all the time making my computer very slow. i have searched for spyware and viruses using 11 different anti spyware! they found some spyware, i deleted them, but they didn't seem to make a difference. i read somewhere that it could some corrupt .avi files so i went through my videos and deleted ALL of them to make sure, but no cpu still at 100%.

what should i do next?!? http://forums.majorgeeks.com/images/smilies/major.gif

 

thankyou!

i have tried all of these things.....

nothing seems to have changed, cpu usage still very high!!

any more suggestions?

 

Please post this in the Malware removal forum and attach the requested logs.
If they say you are clean then that is good.

http://www.defraggler.com/
http://www.ccleaner.com/
Run both of those tools

Check this out also:
http://support.microsoft.com/kb/306542

 

Thankyou but i have sorted out the problem, turns out it was a corrupt .avi file that windows explorer was trying to read! i deleted the file and it all seems to be OK.