If you can get it to boot (even just into safe mode) you can roll back the driver on the properties of the device the driver applies to.
If you can't get it to boot you can run the system repair using the win 7 boot media but will likely loose alot of data doing this.
Other than that I can't think of a clean way that will leave the system working properly with your data in tact. Perhaps HIRENS disc and miniXP or ubuntu on a USB pen would let you access the data enough to manually edit the driver to the old version
Last Wiki Answer Submitted: June 15, 2011 2:26 pm by ErroneousGiant3,120 pts.