I would just upgrade your setup honestly. A P4 is pushing it, and you don’t really want to generate that kind of heat 24/7.
I have some public wishlists on NewEgg for decent machines that most people would find astonishingly cheap. Like under $300 for a system with equal specs to a $1000 Dell.
I’ll have to do up 1-2 wishlists for my own suggested Breakaway boxes. I don’t recommend under $300 cos there’s things that can be done to improve your chances of not losing reliability. 8)
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That being said… have you tried DPC Latency Checker?
http://www.thesycon.de/deu/latency_check.shtml
Have you tried updating your mainboard’s chipset drivers? and GPU drivers?
What language do you speak?,, in case someone here also speaks it.