Do you have a file recovery program? There are several around. Norton is probably best known, Tech Tools is good, there are several others. Try one of those before you give up; it may be your file is fine and your pathway has problems - that can be easily fixed. I seriously doubt your disk is totally shot if you can get other files. Recovery of one sort or another works in a lot of cases like yours. If you can't recover it yourself, take it to the University Computer Center and have them work on it. Take along a blank disk and when they recover the old file, have them copy it to the blank disk.
Best of luck!