From what I read, it fixed a whole host of problems like...
If you make a CD and cant read it in 98/ME
If you make a CD and cant read it in XP
If you add data to a CD and cant read files that were there previously etc etc
basically, it sounded just the ticket cos I have made CD's that cannot be read in Win98 at all !
Havent tried it yet tho, waiting for my next time I need a CD.