Klez Virus?

I am flummoxed. A few people say their norton pops a klez quarantine when getting mail from me (just twice), and I have scoured my box…ran command line scan, the online version from symantec, did a hard target search of the right registry keys and files in the hard drive. Nothing! Ran the removal tool even. Nothing! Any ideas?

Is there some other way this thing could be hiding, or do I go on the assumption both these clients aren’t so bright and it was another email that popped up thenotice, and they just thought it was me because I was in their inbox?