|OK--I'm trying to understand. I'm guessing you are running Windows XP. On older floppies, I don't think that AutoPlay was realized yet, which is why when you pop it in, nothing happens in Windows XP.|
Now, if it is an old MS-DOS game that you are trying to run, you won't be able to do so in Windows XP. While the command prompt tries to emulate the full command-line environment, the executables for NT differentiate to the ones written for MS-DOS, and therefore running an original MS-DOS program or game probably can't be done in XP unless it is a hybrid program--even then, I'm not so sure.
Therefore, to solve this dilemna, you will need either DOSBox (a DOS emulation program), or download an image of FreeDOS, and Qemu Control. From Qemu Control, tell qemu what image you're using (FreeDOS), how much memory you want to allocate, and finally, set up the floppy drive to be emulated through qemu. You should be able to run the game in either Qemu or in DOSBox, which is a lot easier for new users.
This is about all I can recommend for playing a MS-DOS game off a floppy in XP.
If however, I'm understanding this the other way--that is, you are trying to run MS-DOS off a floppy to fix your computer and are *not* running Windows but DOS, then you probably should get a CD image of FreeDOS, burn it, and fix your computer if your boot disk is corrupted.
Either way, I hope I've helped answer your question.