Computer running slow...

[ilovebbs]

My computer is running really slow the past few weeks and I have no idea why. I scanned for viruses/trojans and such and nothing was found. What can be the problem?

My specs are:

i7 860
Ati 2900XT
4GB Geil Ram

Running on Windows 7.

Any ideas guys?

 

[ilovebbs]

I've done disk cleanup and it's running abit quicker. I'm defragging right now.

Is my GFX slowing my computer down?

 

[ilovebbs]

Which HDD do you have windows installed on?

on a WD Caviar Black 640GB. I only have 1 hard drive.