Fastest Fun Game for XP

[mangopearapples]

Hey guys,
I have Windows XP SP3 and 502mb RAM (Rubbish right?) and 1.60ghz dual core processor.
What's a fun game that would hardly lag at all with this sort of specs range?
Thanks.
P.S
I know that Cube 2 sauerbraten is a good one for my laptop, so something like that would be nice.

[striker_1]

GTA vice city will run in your PC, Use emulation games like MAME, NeoGeo etc, And you can also play MINICLIP flash games on your PC :)

[mangopearapples]

I know flash works, otherwise I wouldn't be able to access Youtube!
I don't really like GTA, I'd much prefer FPS games like Call of Duty or Left 4 Dead.
Unfortunately, none of those games work with my stupid laptop.
I have a DS emulator, but I only use that to test my homebrew games without having to insert and take out a memory stick each time I want to test it.
I don't really like emulations.
I already have Half-Life and sauerbraten, they're the only FPS games I've played on this laptop without much lag.
Anymore suggestions people?

[striker_1]

Resident Evil 4 is also a good game. Try it out