I researched on it and found out that on xp, rfactor only uses 2 gigs of ram, yet on a 64bit osi could download a bypass and allow it to run the 4 full gigs. Afterall, i'm only using 3.2gigs in xp. That would solve the issues with adding too many cars, but as for the bsod, it was the first i've gotten ever with this build and i haven't gotten it again yet, but i'll be looking out and stress testing.