I agree with Mange, upgrade that video card, if your stuck for cash go for a Ti-200, otherwise do either an ATI8500 or a Ti-500.
Processor won't last for much longer though, Doom 3 is on it's way and that processor will take one look and run away screaming.
Personally I'd grab a 1.6 GHz AMD Palomino, but some people are rabid intel fans, if so get as fast a P3 as you can get, or if your rich a 2.2 GHz Northwood Core P4.
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Remember Dieppe
