Please provide error message and clarify: is the disc not regonised when inserted? Or are the files on the disc corrupted, but you can see the disc? Is the disc + or -, R or RW?
Try reading the disc in different drives first; if it can't be read in any of them, then it's the DVD. It is possible that the DVD was a bad burn and "spontaneously" deteriorated over a few days, though I've never experienced that phenomenon. If you have Nero, try using
Nero CD/DVD Speed to analyse the disc to see if there are unreadable sectors. It could also be that the header is damaged, rendering the disc unreadable although the data is intact; recovery chances are high in those cases.
You could try and recover the data using software such as
CDroller, though it probably won't recover everything. Try different software if that one doesn't work, Google is your friend.
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