CPU useage shoots up to 100%

[Tod]

Sometimes when I try to open up "My computer" it will sometimes just
hang, showing that flash light just going back and fourth.
Or it will open a C:\ and I'll look in Windows Task Manger and it will
show two C:\ being open and explorer.exe will be at 99% cpu usage.
I do use anti-virus, so I do not thing it's a virus.
Any ideas on this problem ?

 

[Mark L. Ferguson]

To repair all system files, go to Start/Run, and type (or paste in): SFC /SCANNOW