The WSUS Support Team Blog : A large number of driver updates showing up in WSUS:
For those of you with WSUS 3 boxes if you haven’t ran this tool to decline the drivers, do so. It will take a while but will clean out all those gazillions of drivers up there.
If you can’t run this script because you are getting a “GetUpdates failed. Reason: The operation has timed out”, hang loose as I’m investigating what you can do to overcome that.