Yes, I did all of these things, but I'm still getting the splash screen error message. I did have Norton Antivirus pre-installed on this computer, but uninstalled it immediately upon taking it home and setting it up. The splash screen error messages just started about 9 months ago, I'm guessing. I sometimes wonder if it's in conflict with Firefox web browser, as occasionally I don't get the message if my Firefox is not open...yet, still usually do!
Regards,
BP