I have an MSI RX9800 and I tried using the 4.9 betas to speed up Doom 3. I uninstalled the old drivers completely, rebooted, installed the betas, rebooted again, and got a blue screen when booting up. Reverting to having no driver let me get back into windows. I then tried manually installing the beta driver from the device manager in Windows XP SP1, and it immediately blue screened after loading the driver. Is anyone else having this problem?