I got a really, really nasty virus on my PC from that same link (also posted on Crackberry here: http://forums.crackberry.com/f95/os-...1-tour-442151/
I didn't even complete the download of the OS, so never even installed it on my PC. The virus is called Virut.N. I'd recommend you have your IT department scan for that NOW as my regular McAfee just told me I had trojans, but never cleaned them. Every single .exe file on my hard drive was infected, and it also infects .htm and .html files.
As for the ringtone, I'm guessing here, but possibly someone mucked with the file (like how people can make hybrid OS's) and put the ringtone in there as a stock ringtone. Total guess and I could be very wrong.