HD4850 Code 37

[Powderhound]

I attempted an overclock today, which failed, and having reset everything to default and booted back into Windows, I get an error message saying "No ATI Graphics driver installed". Going into device manager then shows:

Windows cannot initialize the device driver for this hardware. (Code 37)

Click 'Check for solutions' to send data about this device to Microsoft and to see if there is a solution available.

I've reinstalled the drivers, and manually pointed the device manager to the ATI directory, but it still isn't working. Any idea what's happened?

I'm on Vista HP 64 bit.

[this_is_gav]

Code 37 happened frequently on some systems with 4gb of RAM or above on some Socket 775 chipsets using the 8.12 drivers. It was fixed in 9.1. Using 8.12 by any chance?

[Powderhound]

Nope, 9.1, but with 4GB RAM on P45.

[Powderhound]

I've tried installing the 8.11 drivers too, but the error remains. Might it be RMA time?

[Powderhound]

*Bump* I hate to be pushy, but I really need to solve this asap.