I hate to report yet another problem, this one is serious. Denny Conrad called to let me know he had contracted a computer virus which cost him $$ and a day of his time to take his computer in to have it professionally 'cleaned'.
It was a pop-up virus - and even 'tho he "never" opens email from folks he doesn't know, this one which had an attachment got in. It locked up his computer and the only solution was to pull the plug and take it to town. He has no idea how it got in.
You just have to be as careful as you can, and sometimes that isn't enough.