guys pls help after installing NVIDIA Quadro Graphics Driver 265.90 Ive had random driver crashes on my prebuilt tower... fine, Ill just roll it back.. :D execpt teh Roll Back Driver button is greyed out, and when i uninstalled it Windows put a driver back on its own, i keep getting this:

USB Audio Device Properties
Device status:
This device cannot start. (Code 10)
{Operation Failed}
The requested operation was unsuccessful.
ive heard of DDU, but people say its dangerous and other people say its the only correct way... i just want to go back to teh driver that worked yesterday, whats teh right sequence?