Game capturing software for older Pc??

[Marinersfan4life]

IMPORTANT details, read all info before posting:

I have a Dell dimension 2350 and ive been trying to find a screen recorder or game recorder that will work with it to record NFS HS replays and etc and none have worked theyve all been extremly slow. the computer has 128mb of ram and a Intel(R)celeron(R) with 1.70ghz of CPU if that helps. But Ive searched google and every search engine and nothing works thats why im asking here. Ive tried Fraps, Fastcappro or something like that and hypercam 2 all worked but skipped tons of frames even when I adjusted the settings so basically didnt really work lol. But if there is none that will can anyone give me a free Movie editing software that will remove the grain or pixelated look from videos?? I have a .mov from a digitial camera that I took of what I wanna take with software but its really grainy and low quality ,so that would also work. so thanks and hope you can "help"
I have windows XP also if that helps