help!! after installing Intel Mobile Intel 945GM Express Chipset Family Graphics Driver 14.20 Ive had random driver crashes on my prebuilt tower. fine, Ill just roll it back. except the 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 ppl say its dangerous and other people say its teh only correct way... i just want to go back to teh driver that worked yesterday... whats the right sequence?