KathW beat me to it:
Quote:
| http://www.sophos.com/virusinfo/articles/perrun.html The virus, known as W32/Perrun-A, It spreads in the form of a traditional Win32 executable virus (usually called proof.exe), making changes to the Registry to mean that JPEG graphic files are examined by an extractor (called EXTRK.EXE) before they can be viewed. If the extractor finds viral code inside the graphic file it is executed.
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As for a virus/spyware infecting your computer through an .mp3 thats just a hoax
http://www.f-secure.com/hoaxes/mp3vir.shtml
If you did get spyware from anything related to mcdonalds it would be from there website wich im betting wasnt the case but I think this thread was just supposed to be a reminder to check for corrupted data and keep the networks clean.