I recently upgraded from Windows XP 32-bit to Bista 64-bit, that took me a while to figure out. So i installed vista with 2 gigs of ram, did all the updates. Now when i go to put in my other 4 gigs of ram vista doesnt load up. It gets to the loading bar then a black screen. I don't understand why and now i kinda wish i just got XP 64-bit, can anyone help? thanks in advance