Even though the CD is scratched, you can still get the information from it, by using software that is able to copy files from damaged devices, such as AnyReader. Secondly, try to restore your computer to a previous point. Some applications automatically create system restore points at the moment of their installation, so you might get lucky. Go to Start, All Programs, Accessories, System Tools and System Restore and pick a date at which you want your computer to revert.
