do you mean that the installer won't run or that the MP3 files you downloaded using Gnotella won't play?
If it's the first make sure the extension is correct and you didn't reanme it or anything.
If it's the second one, try usuing WinAmp from www.winamp.com . I find it's mych better at playing MP3's than Windows Media Player and will usually play anything that the WMP won't. If winamp doesn;t play it and it's a MP3 file, it may be corrupt. Try downloading it again from a different person.

------------------
Magic mat
"On the Internet, nobody knows you're a dog." - Peter Steiner
ICQ# ********