BIG FLOPPY PROBLEM!

I somehow managed to unassign my floppy drive's letter A in Windows XP while in DOS mode while trying to install a game. I got to DOS in the first place by booting off of my old Win 98 cd. When I got frustrated with the install I just typed in B: to see if a B drive would show up and of course it didn't considering I don't have one. Then it said Abort, Retry, Fail. When this came up I said Abort and then a message came up saying that my B drive has been removed. I found this weird considering I never had one. When i went back to Windows XP I saw that there was no A drive in My Computer and the entire OS doesn't even recognize the drive letter. However it does recognize that there is a Floppy Drive that exists. If someone can help I would appreciate it.

Thanks for the idea JCLW, but I seemed to fix it by doing the same thing that caused the problem in the first place. I probably shouldn't play around in DOS having Win XP, but I did get the game to run.