Windows 7 hates me!

I'm trying desperately to figure out why windows 7 keeps crashing with my graphics intensive programs (namely Second Life).

Just tried running second life. It ran for about two minutes, longer than it's run for months! But then if froze. Something about nvidia's driver kernel freezing or resetting came up. I'm gonna try it again.

Nope still froze. Dad says it may be time for a new video card.

If anyone has any recommendations on what to do please let me know! Thanks.