PROBLEM SOLVED!
Spybot (free version) and Malware bytes (premium) did not find anything. So I began to look elsewhere. I remembered that I had recently installed AVG Zen (paid version), so I wondered if there was a conflict somewhere with something else already installed.
Enter "Adfender." When I disabled it, I was able to use the upload feature here on TestMy.net. There had never been a problem before, so I am assuming there is some sort of conflict between Adfender and AVG.
Anyway, thanks so much for your trouble and time!
I followed your instructions, but did not have any success. Same result.
I'm going to run spybot and see if it finds anything. Will let you know what I find.
Thanks so much for your time.
Well, I didn't have many extensions to start with, so it didn't take long to disable them one at a time as you suggested. I also relaunched Chrome after each one and tested again. Same result. It's obviously something with Chrome. (It is the current version, btw.)
I just used IE 11, and it tested fine. Must be a problem with Chrome (which I prefer) but I just don't know what it is.
Thanks for your help and the time you've taken.
Thank you. AT https://testmy.net/mirror, there is a "Test My Internet" button in the upper right corner. I thought I would try that one--it did the download test fine, but as soon as it tried the upload test, I got the "Web page not available" again.
If anyone can help I would sure appreciate this. Something apparently is blocking uploads from my computer. I've disabled virus software temporarily to see if that made a difference, but it did not.
I am having problems uploading images to Zazzle, CafePress and Greeting Card Universe, so I thought I would test my upload here at testmy.net. Whenever I click on the download button, everything works fine, but when I click on the upload button, I get a "Webpage not available" message.
I am using Chrome on a Windows 7. Everything is updated.