I was installing the latest version of McAfee Internet Security and during the install process about 3/4 of the way through, the Mcafee install screen went blank. I let it sit for 10 minutes and it eventually came back with install complete.
I was able to uninstall & reinstall McAfee Internet Security and now the system works properly. Weird. I have install this over the years with no problems. This time on this computer, though, it must have messed something up in the install and recorrected on the reinstall.