new mouse -> laggz

Hi guys

need ur help :/

Bought a new mx518 today (was using the same all the time), installed drivers + updates and now my ET is lagging due to fps drops :o can move about 2 meters ingame, then comes a fps drop to ~20 fps and can again move ~2 meters and again fps drop..

did anyone have had the same prob? :<

edit: its the same when i try it with my old mouse/another mouse....

greetz sad panda madi :<