So I recently installed Windows 7 x64, the install process went fine and the Upgrade Advisor said that everything was compatible. The problem is that I tried upgrading from two 1 gig sticks of RAM to four 1 gig sticks of RAM; this led to a Blue Screen of Death on start up. All of the sticks are exactly the same Corsair xms2 DDR2 800 mhz, my motherboard is a TA690G AM2. The BIOS recognizes that there is more RAM and it doesn't seem incompatible there... I have tested the new sticks by swapping them out with the old ones and Windows works just fine. Also Windows thinks that BOOTMGR is missing, forcing me to leave the install disc in the drive whenever it boots. For the boot manager problem I tried the repair function on the install disc, but nothing has worked :( any help pretty please?