when i tried to download a .exe file, it asked me a question about if i wanted to open a file that might contain a virus. and i clicked the box that says "don't ask me again" and i accidently clicked close instead of yes. I don't know what to do now. can anyone help me???

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.

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"Never Argue With An Idiot. They Will Drag You Down To Their Level, Then Beat You With Experience"

thanks =)