Commercial polishing compounds in liquid form can be used to polish off lightly scratched disks but do it only in the affected area to see if it works. Use alcohol to remove the glare caused by the cleaner before sticking it into the drive. If that still doesn’t work, the scratch is so deep that there is no turning back and you’d have to go to a friend’s house or buy another copy for your purposes. Good luck and remember, keep all important disks stored in a safe place where they would be easily accessible for future use. If you need drivers, you could search for the in the manufacturer’s site or in the many driver sites such as driversguide.com and others.