Boot in safe mode, right-click on My Computer, and go to properties. Then go to the device manager. Make sure Windows is only seeing one floppy drive. If not, delete all of them and restart. Windows should re-detect your floppy when it restarts.
If that doesn't work, try looking here:
http://www.computerhope.com/issues/ch000359.htmClick here for the cure to all your PC's ill's.
Except for Linux ills, of course.
