I am feeling that I should cautiously poke my head around a figurative corner, admit that my PC sent out a virus-laden email, and duck back out of sight.
It has been a long time since one of those emails got the better of me.
This one, appearing to be a file attachment from a trusted source, lured me into opening it and unwittingly spreading the problem
In spite of several frustrating hours I can't access my usual email program and can only use a web-based email. I think that my nearly new PC will need a visit to the local shop.
Since this sort of thing trolls through the address book and sends junk to everyone I've ever emailed, I can only hope that most recipients were quicker on the uptake than I was.