Thank you very much for the help everyone; the time you have all put towards helping me is very much appreciated. It seems, for the moment, that everything is functioning correctly. I thought I had done a clean re-install already, but I suppose I may have forgotten to delete something before installing.
I can't say for certain that it was the clean re-install that did the trick, or if it in fact was my anti-virus program causing complications when installing. Perhaps I should have done a process of elimination, in retrospect. In any event, it is now working, for the meantime. Again, thank you for your assistance.
