Have you tried safe mode? tap F8 repeatedly during start up, then select 'safe mode' from the menu.
While in safe mode you should be able to uninstall the drivers.
To prevent 'automatic restarting' control panel>system>Advanced tab>Startup and recovery settings button, and untick 'automaticall restart'. (but you will not be able to do this if the PC wont let you use it, but you should be able to do it in safe mode)