DaveLembke -
Thanks for your reply. To answer your first question - I always clear everything down to the screen picture before I shut down. Second question - I run my security (Avast, Melwarebytes, superantispyware) every 2 or 3 weeks. It has always been clear. Last week I had a computer repair shop clear a problem with the internet supplier shutting down but this problem was before and after that. This is not a big problem but just seems to be something that is not right.
Thanks again. Bob