How to Uninstall/Reinstall Nebula 3 Pro?

[lmacd09]

Last night I installed N4 cause I wanted to try Mantis, after having Nebula 3 Pro for a couple years. I couldn't get it to work - it kept crashing, and then Nebula 3 would crash. I uninstalled N4 and now I get the following error with Nebula 3. I was told to uninstall and reinstall Nebula 3 - however I don't know how to do it properly apparently. What are the steps I need to take? I found an old post on the forum with details but it doesn't seem to apply anymore, as far as I can tell. It's been so long since I first installed Nebula that I forget all that was involved (what with .ser files and .aut files and programs and vectors and .dll's, it's a bit confusing), and now with N4 there seems to be less info available for Nebula 3. Any help would really be appreciated, I was supposed to send a band some mixes last night. Thanks!

Luke