It just gets more than annoying. You know, people start asking "why am I gettin replies to e-mails I never sent?" or in the case of my Boss, even with McAfee (I have Norton thankfully) 35-40% of his e-mails are junk from other people who have been hit by the virus.
If you can't afford commercial anti-virus, at least download AVG Free (www.grisoft.com
) - it's free, it's basic but it does the job.
As for those that have not much better to do than access others' computers "for fun", I think they should be forced to spend a day in Bill Gate's office for a day as torture and then released back into the public fully rehabilitated ... and hopefully only deciding to target MS, if they haven't fully been cured.