If you visit 'Symantec's AntiVirus Research Center' (click here!) pages, you can download 'fixes' for most worms - free of charge. You need to know which worm it is, though. Usually the 'return' receipt will tell you.

The reason why not all your messages seem to be affected is the poor buggers haven't got protection either, and they've become infected, too!

Download the 'fix', then make sure you get protection!!