FS9 xp

Hi all, I have purchased a new computer:Q95504gb ddr2 1100 ramX48-dq6 ram4870x2 x 2 in crossfirexI am running fs9 on xp and when I hit ALT to go into menu, it takes about 10 secs or longer for anything to happen where in my old system: E6400 2gb ram 7950GX2, it was instant. I can't find the problem. I have tried numerous installs on xp and problem is still present. I tried an install on Vista 64 and problem gone, but I prefer XP,Any ideas???