Vista - recording my screen

I wanted an application that records my screen, so i can upload my game play videos onto a website, like youtube or wherever. but whenever i start recording, it just laggs the crap out of my computer. i got a good computer and im even trying to use it with really crappy games, but it still laggs really bad. i even change the fps, but when i go too low, it laggs, and when i go too high it laggs...any help?

is it the application im using or what? cuz there is no way it should be lagging my computer so bad, it goes from like 60 fps to 20 fps when i start recording. whether i put it on 1 fps or 1000 fps recording, it laggs the same....any help please.

thanks

hmm, erm i havn't really come across a good screen recorder tbh, used quickscreen recorder once and that was awful and is it fraps? i could never get that to work either, so i dont think theres a great deal of solutions out there, maybe one you would have to buy *cringes* sorry carnt really think of anything else, unless you want to go down the webcam pointed at screen route...thats always a laugh lol

I use Snagit, very lightweight and fast. It does screenshots, as well as screen captures and saves capture as avi.