Read posts here on this problem. SFC SCANNOW did nothing that I can see. The Java suggestion does not seems applicable as I don't even have those entries given in my Registry. Have never had this problem before, and have no clue where else to look for a solution. Any guidance is much appreciated.
How much RAM do you have? After you double click on add/remove programs, open the task manager, give it a couple seconds after task manager opens, and see if the RAM and CPU usage are high. It may just be taking a long time.
Boot into safe mode with networking (F8 on startup). Download, install, and update malwarebytes. Do a full system scan. www.malwarebytes.org/
Also, when running ccleaner, sometimes you need to run the registry scan several times before it can fix everything.
Thanks again for your help. I ran the Malwarebytes, full scan = NO infections of problems found.
Ran CClearner just once (didn't see your last message until I came back to tell you results) It came up with some innocuous-looking stuff, temp internet files and such, and I went ahead with the delete suggestion. Upon reboot, was able to open Add/Remove Programs and it populated readily as it usually does.
As for RAM, 2 GB, and unfortunately, I didn't do the CPU usage check you mentioned until after the other actions were taken, saw nothing out of the ordinary. But, as all looks to be in working order now, so again, whatever was bugged is somehow debugged, and I thank you!