This is Jim's son-in-law, I've kidnapped his account temporarily ;)

Bruce:

Try these links:

http://securityresponse.symantec.com/avcenter/venc/data/w32.yaha.b@mm.html
http://securityresponse.symantec.com/avcenter/venc/data/w32.yaha.e@mm.html

It is either both or a variant of this base virus that you've got from the emails that Jim received.
Instructions are there too.

-t