To expound on what nihil was telling you:
If you go into your device manager (the same place where you roll back the drivers) anouter option is to uninstall or delete the drivers that are there. Then when you reboot, XP plug and play will detect what to it is new devices and prompt you to put in your installation disk, so that it can reload them from the source.

Edit> Also http://www.driverguide.com/