Another thing you may want to try is take the disk to a video store/gaming store and see if they can remove the scratches for you. You can buy a scratch remover yourself but generally the store ones are much superior to the retail machines.

Another option that MAY work (has for me with my rise of legends disk) Is to copy the files from the disk onto your hard drive, then from the hard drive, copy them to a new disk. Not the most likely way to get the game to run but it is worth a shot. And as I've said has worked for me.

Try to rip an image of the disc using something like ImgBurn, then mount using VirtualCloneDrive and install that way. If you have multiple systems you could do something like this:

#1) Rip to image using other computer (aka, computer #2 for sake of conversation).
#2) Share a directory on computer #2 so computer #1 can get to it.
#3) Install VirtualCloneDrive on computer #1 and mount image from shared folder on computer #2.
#4) Install, patch, patch ..., play.

If you have a portable hard disk, then connect it to computer #2 and rip an image of the disc and then copy over. Mount from the external hard disk on computer #1 and install, etc.

Just some thoughts. I'd suspect the optical drive over the disc myself, but that's usually how things work for me.