Hooman, I am assuming your either using Xeon or I7. My friend is crazy, he just got some triped out quad video card display just to run flight simulator on full with 180 22" monitors. I say thou, I got this running with Win 7 on the EEE PC 701 (1024mhz, with 2gb of ram), and it runs fine, even with IRC in the back round. Have no clue why it would be giving you a problem.
BTW, I got one of those HP Tx2 (touch screen laptop), and it's sick playing OP2 with it. Might make a video, to show off. For some reason, I like "unique" laptops...