The discs that are available now have been on the market since last October. In my opinion, if these were a sales success we'd have seen more than the original titles by this point in time.
Mine did this. After retracing my steps, I discovered it was XP Service Pack 2 that was wreaking the havoc. I uninstalled all my DVD player software, then the DVD drivers. Reboot, load DVD drivers back in, reinstall powerDVD, winDVD, Nero, etc. Voila! Then it was good again.