Right, I enabled Device Manager to show devices not currently present. Went to View >> Hidden Devices and was able to see my 460GTX. I uninstalled it, restarted and it worked! Then I just re-installed the Nvidia drivers and everything seems peachy.
I don't dare turn Driver Verifier back on. But on the plus, Daemon Tools isn't installed because I rolled back to before I installed it! Will keep an eye out for any BSOD's in the future and post them up. Thanks for your help so far BlueRobot, appreciate it!