Wierd grafic lag on LOTR BFME 1

[Nico D]

I got this wierd lag on the title screen and ingame when i move the mouse i get the lag, even when i play the game even with lowest grafics it lags ive tryed to update but no changes has happend, i got 1gb ram and 2.0 ghz amd atheon 3000+ processor and a nvidia msi NX7800GS grafic card so i sound'nt get this lag , Im borrowing my friend's bfme2 and im running it on the highest grafics with no problems whatsoever, ive tryed to run bmfe1 on a image file, so its nothing wrong with my disk i think. Any one got any idea to fix this?