New Nvidia Beta Drivers = Slow system

yesterday i was told the new nvidia beta drivers which were meant to help fps in Guildwars 2 so i downloaded and installed a clean copy of the drivers. 306.02 drivers were installed and now ive lost the Windows AERO effect and overall my graphics have dropped dramatically. i have done 2 system restores to before i added drivers and nothing has helped. Uninstalling them and going back to stable drivers made no change, so now im currently back on the new beta drivers but would love insight on how to completely remove the drivers for a totally cleam install. btw im running 8gigs of ram, SLI gtx560 Ti's Windows 7 x64

Uninstall then follow the link to completely remove the driver:
Drivers - Clean Left over Files after Uninstalling
Then install the latest driver, this will give you your "Clean install"
Driver autodetect Nvidia: http://www.nvidia.com/Download/Scan.aspx?lang=en-us
*will need java to run*

thanks ive done that mutiple times, not sure what could be going on. when i restart windows it sits at the loading windows screen and never changes to the login screen

If it hangs on loading windows, then try unplugging things like mouses, usb, etc..
Also run this : SFC /SCANNOW Command - System File Checker
Probably wont fix this problem, but it's a good task to carry on with. Run it 3-4 times with reboots in between if it is finding and fixing errors. It may even fix it miraculously.
IF troubles still exist this would probably be the fastest and most reliable fix: Repair Install