First of all, thanks to all who have responded with such helpful suggestions. Second, please accept my apology for the delay in being able to return. It's canning/freezing season here and I've hardly had a minute to do anything else.
Vic, thank you. I do have Firefox and yes, the box said "scanning for viruses". I just tried your suggestion with calling up Tools, Downloads, etc. and it did show a symbol for what looked like CCleaner, along with a box saying it could contain corrupted files (or something similar) and did I want to continue. I clicked 'no', intending to come back to ask what I should do, and then when I opened it again to see what it said so I could tell you, clicked 'ok' by mistake. A page came up with 15 icons! I know I tried to get it many times over the past couple wks. I clicked on one with the number 224 (some had 223) and finally, I got the page for installing CCleaner again. Whew~!
DennisD, I was about to try your suggestion when I noticed Vic's post and thought I'd try it first.
ePost, thank you too. I have AVG, ZoneAlarm, AdAware, Spybot, and SpywareBlaster. I don't know about malware, but as soon as I can find a few minutes, will try your suggestion for Malwarebytes. My machine has been running very slow, but I have so many things in Favorites and many notepads, so contribute that to the problem. Also, thanks for the help with downloading the CCleaner, as it's sometimes confusing. It generally comes up with the one for Paypal, and since we've contributed twice, can't do it every time a new update is available, so I have to figure out which link to click.
Sorry to be so long, but one more thing: This forum is great, but I had trouble finding out where I posted later when I came back. There are so many different topics and pages. When I found it, I left it at the bottom in the tray. Is there an easy way to find the different topics or does it require staying here until you learn it all? Yikes ! I would enjoy having a little time to research some further information about CCleaner, so I can learn about the different settings.
Best Regards,
PS: I never did uninstall CCleaner before to do the updates, but this time, when I couldn't get the new update to work, found the forum and took the advice where someone had mentioned doing that.