I'm afraid if the software you describe doesn't work, it's probable that the filesystem is too corrupt to be recovered.
Packet writing software like InCD can sometimes finish up this way - and this isn't helped by each spot on the rewriteable disc used only having a limited number of rewrite cycles possible before it fails.
The only answer is to not entrust the only copy of important data to a packet written disk - or if you must use packet written disks for important data, keep regular backups of that data.
For moving around a few hundred MBytes of data that you're working on using various computers, one of those USB pen drives is probably a more robust solution (though you still need backups!).
If possible, use mastered discs (that is the main Nero or Nero Express programs) for robustness - ideally on write once media. Multisession is best avoided if you can - sometimes adding a session to a multisession disc can go wrong and lead to loss of data too (though it is much better than packet writing).