Brunzwik,
As for the deleted posts, I have no idea what happened. There was a period of about 9 or 10 days where my whole computer was taken over by viruses. I can only assume that someone got access to my computer that way. I formatted the hard drive after that and since then, all my posts have remained here on APS. I know VERY little about computers so really can't explain how it happened.
Simon Archibald