phu--how do I do that?
are you using winamp to play the files?
it should work even without repairing the file header, but other players could have a problem with that
to repair the header using winamp open the song in winamp and press [ALT] + [3]
the file info box will come up - uncheck the boxes "ID3v1 Tag" & "ID3v2 Tag" and click Update
press [Alt] + [3] again, the ID3v2 Tag should be returned from the dead (this is the error)
uncheck it again and click Update
now the header is repaired and the file should play everywhere
now you can enter the correct ID3 tags of course - this will not corrupt the header again