after installing Dell XPS M1730 Ageia PhysX Processor Driver A00 Ive had the control panel wont open on my gaming desktop. 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 people say its dangerous and other people say its teh only correct way. i just want to go back to teh dirver that worked yesterday. whats the right sequence? what am i doing wrong??