How do you fix a Universal Media Disc when its ruined?

Most video rentals and CD and game stores usually have resurfacing machines, but make sure they have a machine and not one of those cheapo devices. Those usually destroy discs.

Bring it to your local game store and ask if they fix scratched disks.

YOU CANT IF ITS SCRATCHED BADLYotherwise try Windex, hot water, those cloth things you use on psp's or laptops

There are places which can simply skim the disc, and hopefully it will work again, obviously for a small payment. There are other devices which can also fix games, but it depends what kind of damage...

Get a CD cleaner or go to a CD cleaning place. You could also bring the game to the place you got it or nearest vidio ame store, depends on the damage done. If the scratch is really bad I have had...