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If you want to recover data from your two discs, and your box has a CD-ROM or DVD-ROM drive as well, you may first install the latest version of EasyWriteReader from www.ahead.de
and try to read your discs in this drive. Otherwise do this on another box with a drive that can read CD-RW discs (EasyWriteReader works fine on 98x, W2K and XP, barring driver conflicts).
Were these discs formatted to classical UDF or CD-MRW (Mt. Rainier)? What is the brand and speed rating of these discs? Did you use them in a single burner, or several ones? What burner(s) do you have?
Did you try several other discs to check that InCD operates correctly on your box? If InCD handled other discs well, this would imply that your two backup discs went bad. It is not uncommon that a single disc fails, but the probability that two discs fail at the same time is pretty low. Did you use those discs together in each backup session?
On the other hand, if now InCD can't handle other disc (and you should test at least a couple from different vendors), something might have changed during the last two weeks (hardware, firmware, software). Are you really sure that you didn't install any burning plugins, e.g., from WMP? You could extract the initial information section and the final "Existing Drivers" section from the Nero log file and post it here. Similarly, you may post the results for the dir commands given in S11 of the guide
http://club.cdfreaks.com/showthread.php ... adid=60163