Warcraft

ok strange problem,

i used to be able to run 2 copy of wow at once on my hardware running vista 64, now on windows 7 its not possible, it just grind to a halt


my hardware is

Intel Q9650 (quad core 3 ghz)
6 Gigs PC800 DDR2
ATI 4850 Graphics.

like i said the hardware is exactly the same just different os, I can even run two copy's of Wow on my laptop , XPS m1530 , dual core 2.5 4 gigs of ram its running vista 32 bit.

any ideas

i figured it out need to turn down shadow quality in video/effects now i can run two clients again