Have a HPm9402f Phenom Quadcore with 7gigs of ram. Upgraded the graphics to a 9800GT (PCIEx16) and the PS to a 500w. Did a fresh install of Windows 7 and now the computer will go just past the first Windows 7 screen then lock. I can pull up the OS if I go into safe mode and graphics does fine. If I switch to on board graphics everthing works fine. I tried disabling the on-board graphics, going into safe mode and loading the driver that came with the card, thinking that the windows driver is conflicting. Same problem, windows hangs just prior to finish. Appears to be a conflicting driver but I cannot determine which one. Also, I have set primary display adapter to PCIEx16. Is there a logical way to determine the culprit driver? Any ideas?