How to completely remove extreme?

[Squeaky]

Sigh.
I think I made the fatal mistake of removing Magix photo. All was fine until I tried to use some filters in Xtreme pro. Once I did I got all sorts of errors saying XPE 3 is not registered - and no filters appear. Charles did say there might be problems when I mentioned in another thread that I had removed magix.

The story gets worse. I have reinstalled the Xtreme pro package several time now and still get the errors. The only way to run Xtreme is with all the administrator privileges turned on and even then I have to OK it every time it runs as Microsoft doesn't recognize Xara as trusted. Not only that all my lovely xara thumbnails in explorer have vanished.

So. My question is: Is there a way that I can completely uninstall Xtreme pro on Vista so that I have to re-input my registration details. So I can start again absolutely from scratch.