Operating system: Microsoft Windows XP Professional Service Pack 3
Browser: Mozilla Firefox
Vid card: ATI Radeon HD 5700 Series

So I recently purchased this new video card since the old one I used stopped working properly, and ever since I installed it I've been having weird FPS lags in Quake Live, all other games seem to work well tho. The problem mainly occurs when I spin the mouse in game, it tends to give some sort of lag every time I do this. This didn't happen before. I tried playing the game on lower settings but nothing changed.

Anybody have suggestions for what should I do?