wow this is going back
But here it goes, type in A: then press enter to take you to the right directory. Then type in DIR and you should get a list of everything thats on the disk. then look for the .exe file. then type in that file name followed by the .exe extension. for example a program called xxx you would need to type xxx.exe Then press enter and it should run the executable file.
Fingers crossed this will work for you, if not you will most certanly have to take the advice of my team mates and reinstall.