Yes, another drive took over the "C". Microsoft won't let me change any of the drive labels. When you go into Administrative Tools, and attempt to change a drive label, it tells you you can't change any. Also I have tried at least 10 DVDs which are off the shelf and none will play. Again, DVDs I burned run fine. Microsoft is telling me that the DVDs are not formatted and may be corrupted. I don't have any repair discs. Dead end I guess.