Thank you very nuch bob3160, ondrejz and Asyn !!!
It did work !!! (running compatibility with Windows 2000, since I tried first with Windows XP SP3, which was the default selection, and nothing changed). Greetings from Spain.
I haven't been able to use the browser since about April the 20th either. I tried turning off hardware acceleration, and I really have no idea what the ramifications of messing around in there are..... as I started the nVidia program that runs my video card because windross 7 wouldn't let me disable hardware acceleration from the control panel. I had to first add avast secure browser to the list of software it (nVidia) was supporting, then I tried to turn off hardware acceleration, but instead had to turn off about 10 options individually (oh, that program they made really sucks), some of which couldn't be turned off....
That didn't work....
Oh, and, I BARELY stumbled through the process (using computers for 20+ years), I have NO IDEA how my mother could do this... oh, wait, it would have been IMPOSSIBLE.... Welcome to the "world of computers, 2019", STILL unusable by the average person!!!!!!!!!!
Anyway, what you recommended worked (I tried windross 7 first, that was a no-go).
Ok, you tried 2 ways, I went straight to windross 2000 and it worked... but, really? I'm supposed to use this in windross 2,000 mode?
So, if I reinstall Avast Secure Browser, I'll lose the history and various other things in there, right? Of what value is that, if it's unreliable? There are IMPORTANT things in there.
Can I reinstall without losing the passwords, bookmarks and a few other things in there, or not?