Could be allot of different things type of file Mp3/.exe/wmv. It could be a corrupt file. Since you are a newbie I would suggest you read some of the sticky's provided in the forum I will give you a couple of links to some very important ones the rest is up to you.

http://www.gnutellaforums.com/showth...threadid=41432


http://www.gnutellaforums.com/showth...threadid=35986

I would suggest you read through these. The first link is about Viruses on the network which from reading your post there is a good chance you may have already downloaded one and opened it. Thus infecting your computer.

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A little common sense goes a long way

Later Grandpa