There is little or no use tracking where these virus email come from.. 99% of the info is spoofed..
Just delete them and move on...
If you are getting heaps, it just means some newb with a fast connection, who has your email in his cache/history/address book/etc, has executed the virus, and doesn't know they are sending them.
Get a decent AV program and get back to work
http://www.grisoft.com/
DD