First of all, it is quite dangerous to download .exe files from file sharing networks since most of them contain viruses and/ or trojans (and their likes).
If you've accidentally confirmed something you would like to reverte, go and read here on how to change this:
http://www.gnutellaforums.com/showth...176#post154176
Though this thread talks about license issues, the suggestions made there will also solve your problem.
