Have you checked the XP DMA bug? Google it if you need more info.
I have a Dell 9100 with 4gigs ram 2 drives. Everything is working great except I recently noticed that it seems to stutter.
Opening a miniclip game to test it I noticed the tank would go and then stop then go and then stop even though I am holding the go key down.
I then opened word 2007 and held a key down and it typed then stopped then typed then stopped even though I was holding the key down the entire time so it is the machine not my comcast internet connection.
Before I take a step of tearing and reinstalling the operation system I figured I would throw it out there to see if anyone has had this problem before or maybe has an idea of what it may be.
Any help appreciated.