Thank you very much for the quick answer, Bovi!
I tried that and found some particles, which I deleted. Then I tried to install again, but now my EB-Exe from the Torrent was corrupted, just like another one, which I downloded from filefront before. Both of them were not corrupted before, so I think, maybe the particles, which I deleted in the registery, were situated inside these files.
Downloaded again and same problem occures. New File is not currupted, but the installation crashs because of EB081av2.msi. Also, still EB 0.81 resists being deleted.
I think I'll give up for the day and try again tomorrow with fresh powers.
Thanks again for trying to help.