There are two programs that usually are advised when this gets asked :

Tag & Rename
and
Mp3 tag Studio

I'm using Tag & Rename myself. Dunno why. Probably because it was the first program I used and since it does everything I want it to I didn't bother to try the second.
Some people swear by it though.
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Riocar 80gig S/N : 010101580 red
Riocar 80gig (010102106) - backup