And, if something worse has actually happened and you have a particularly nasty virus that changes the file extension name of .mp3s,

Click on > .mp3 File Name Change Problems? Try Rename-It!

This, hopefully, will be a 'last resort' thing to do, but it makes sense for you to know about it !
The program is safe and clean and is another gem from Sourceforge.

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Fusion for REAL!--CDex 1.51--Wackyuses--Bitzi - Check Files Before Download !--.mp3 File Name Change Problems? Try Rename-It!--Alternate PORTS--Avast- Anti-Virus--WindowWasher--IrfanView--PC Pitstop - Test your PC !--Mac OSX Troubleshooting--GO .ape ! - For 'Lossless' Audio Compression--Port :6346 - Test If It Is 'Blocked'--Cole2k Codecs--OldVersion - Newer isn't always better !
Nod32 - Free Virus Scan: Use ESET's Online Antivirus Scanner

Tomorrow's forecast:
Sunni in places, Shi'ite in others...

Thanks RobertR, LOTR and Ursula.
Things have gotten worse, my whole library of 900+ songs has just vanished. Let me figure out and I'll need help again.