You do not need a back up for this task.
A back up is a totally different thing.
With a backup, you are making a second copy of all, or part of, your file system, on another hard disk or whatever, in case your hard disk fails.
You just need a restore point, which allows you to return to the point at which you created the restore point, if something goes wrong while installing the new driver - you haven't lost the hard disk.
Whenever Windows does an update it creates a restore point before it does it, automatically.
There is a menu item to create a restore point.
Google "create a restore point in windows 7" for instructions.
Last edited by finncapt; 10th Dec 2013 at 14:32.