Technical Problem with Sage 50 student version


I have the student version of Sage 50 for a class I am taking in college. I am nearing the end of my semester. I have a couple more projects due for this class, and now my Sage 50 is not working. When I double click the icon to open it, it goes to that gray screen and then won't respond and open. Earlier tonight when I backed up some of my work it gave me an error message that said there was a fatal file 100 flaw (or something like that). Now I can't even open Sage 50 because of the above mention problem. Why is it doing this, and how do I get it to open? Thanks!