According to your pictures, the files are being renamed like this:
name.mp3.vbs
This is bad news! The file is trying to have two different extentions on it, which makes it completely useless. It looks like the MP3 files on your computer are trashed. (Yes, you will need to redownload them
) The one shown in the picture is only 10kb, which means that whatever program took over changed the size of the file. It is unrecoverable now. It could be a virus like FatalXception said, or it could be another program just messing stuff up.
What happens when you click on the MP3? Does it take you into Winamp? A different program? (if so, which program) Or does it do something else? I don\'t know if I can help too much without more information.
One more thing. Do you have Visual Basic on your computer? I think that might be the program that is causing this problem.