XP SP2 Core 2duo 3.0Ghz 9600GT Asus P5K 2GB Ram Soundblaster Extreme Audio Bulk 1x 500GB 1x 750GB 1x 80GB I've had four XP-installations on this computer, only thing changed is I've added the 750GB. First one I had this problem. Second one, I hadn't. But other problems developed so I reinstalled XP. And that's the third, thats when it came back. Now, I tried installing it AGAIN, the fourth, and the problem remains. The problem goes: It's most noticable when running video or audio files. If I do, and at the same time browse folders, move files, delete files, open files, create files, install programs, the audio and video starts to stutter, the word "Stairs" pronounced by some person in a movie, comes out "Ss-t-t-t-aaaa-i-rr-r-r-rr-s-s-". I notice large CPU-spikes whenever this happens. This is a problem from the beginning of the XP-installation, not a developing problem. All disks have been defragmented. It's NOT a virus. Temperatures are normal. Pagefile is 2GB - 4GB, and is not spiking. Really need some help on this, thank you.