Freeze during gameplay

I have Win xp SP3, Radeon 9250, 1.5g ram, p4 3.0hz
During gameplay at random the game will freeze, the sound normally keeps playing along not stuck on the last sound before it froze. I have to CTRL, ALT, DEL and ALT TAB to get out of the game and then get back in so i can keep playing. Sometimes it takes a game or two for it to happen, sometimes on the first game.
Yesterday it happened several times and then it rebooted my computer. I had the blue death screen disabled from coming up so im not sure if it would have come up.

Is it the video card causing this?

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