Does this restore the previous driver that was installed before this one?
"Roll Back Driver" in Device Manager will restore the driver that was previously installed. If you had driver A, installed driver B, and then installed driver C, "Roll Back Driver" will only go back to driver B. You wouldn't be able to use this facility to get back all the way to driver A.
Do you know what happens if you System restore more than a week ago? A computer friend of mine claims it would brick the computer. I don't know if this is true or not...
It's unlikely to brick the computer. System Restore doesn't restore everything, and in particular does not restore personal files, such as e-mail, documents, or photos.
The farther back you restore, the more likely there will be some incompatibility between some setting that was restored and something it relies upon that was not. Windows 7 does have a feature to "Scan for affected programs" after you select a restore point. That's supposed to warn you that you might have to reinstall some program. See the first screenshot below.
There is, however, a safety net: just before you do a System Restore, a new restore point is created so you can "Undo" the restore. That is, if you choose your Oct 1 restore point and you find that after that restore operation is done something isn't working properly, you can "Undo" the restore and get back to today.
System Restore itself will warn you if the restore point you selected is "too long ago" (and I don't know how long ago is too long). See the second screenshot below.
It's a bit odd that Oct 1 is your most recent restore date. By default, Windows 7 creates a restore point every 7 days if no other restore point has been created during that period.