Somethings using all my processing power

[KingOfAquitaine]

Not quite sure where to put this, so decided may as well be here.

Since today (as far as I am aware) my PC at mimimum activity (only messenger and a browers) is running at 68-100% CPU usage and i have no idea why. explorer.exe is using 50% of the cpu, sounds like some kind of virus to me but I can't find anything.

Don't really know what to do, any advice, suggestions??

 

[KingOfAquitaine]

Like I say, nothing else is running (well apart from the usage monitoring program), doing anything causes a huge spike in use to 100%, usually runs at almost 0%

Bit worried really

 

[KingOfAquitaine]

CTRL ALT Delete- Processes- sort by CPU %

Only thing apparenytly running is explorer, and ending that makes the desk top disappear ^^