Gnutella Forums - Can't download .exe files

A few days ago i received a message asking me if i would like to continue downloading .exe files because they are likely to contain viruses... this was when i was about to download a .exe file. I accidentally hit 'no' and now i cannot download any files that have the file extension '.exe'... i don't see where i can reverse this in the options menu. I tried uninstalling and reinstalling Limewire but it didn't work. Any help or useful advice would be truly appreciated... thanks in advance to anyone reading this and offering any kind of help for this issue.