Does this happen with other CD's are placed in the drive? If it doesn't, it's almost certain the drive is OK.
Are you perhaps trying to load a program from DVD, when all you have is a CD drive? Check whether your drive is a CD/DVD or just CD and also what is the software disc - CD or DVD?
Will the Sage software disc load on a different computer? If it does, then suspect the drive may be faulty or incorrectly configured. It is also possible the drivers have become corrupted.
Occasionally, a drive simply wont read the media for no apparent reason, but this is most common with home recorded discs.