Remove a Driver Package from the Driver Store

http://technet.microsoft.com/en-us/library/cc730875.aspx

Determine the name of the driver package in the driver store 

pnputil.exe -e >> c:driver_name.txt

Remove a staged driver package from the driver store 

pnputil.exe -d oem#.inf

Make sure to replace the # with the number of the .inf file you want to remove.

If the computer reports that the driver package is in use by a currently installed device,

then you must either uninstall the device first, or use the -f on the pnputil command to force deletion of the package.