InCD 3.3.7.1 update causes problems

I just downloaded Nero 5.5.9.17 - no probs yet. :smiley: BUT IN CD has been a cow and corrupted my registry (I think), so every other time I start the computer, I have a registry problem, need to fix it (Microsoft Reg Checker) and on reboot, In CD crashes (Esc to quit). I uninstalled EVERYTHING relating to TDK Digital Mixmaster, Nero and In CD and reinstalled it. All good until In CD 3.3.7.1’s reinstall. I’m ready to wipe it, but the CD-RW I created with it probably won’t be readable with the older release 3.1.4. GRRRR!!! Suggestions? Heard of this?