Hello all. I recently upgraded my OS to 64 bit ultimate from 32 bit. After install i noticed that my graphics cards, 2 x HD 5770's in crossfire, are not working. I go to device manager and it says that i have 2 standard vga graphic adapters. One has a yellow triangle. Now bear with me on this. I have tried everything from windows updates and manually getting the latest drivers from ATI. The windows update does not do it and when i manually download and install the drivers, i then restart it. Upon restart it will blue screen during load up. I have even tried to just uninstall the driver when it boots, it says restart, then gay windows just reinstalls them. I then have to boot it up in safe mode and go to system restore to put it back to how it was and its driving me mad. When i go to device manager and properties. Under the general tab it states that this device cannot start code 10. The driver says its here - c:\windows\system32\DRIVERS\vgapnp.sys Obviously i just want to install my drivers again I just need some help on what to do. Both cards were working before reinstall. Anyone help me? Many thanks in advance.