I have had a problem upgrading to Win 10 on my Win 7 computer.
After upgrading, I installed ZoomText and Window Eyes,
latest version and as long as WE was not running ZT worked fine. But if
I started WE the screen would flicker. If I uninstalled ZT and just run WE everything worked fine. I spent sever hours on the phone wit ZT tech support, but no solution was found. After that I uninstalled ZT and WE and installed Fusion. Same problem. So I'm giving up on Win 10 on this computer and am reinstalling Win 7 from a system image I made just before upgrading. ZT tech support said they had not seen this before. By the way all display drivers were up to date. And the computer is a Dell, I just bought back in the spring.
"For God sent not his Son into the world to condemn the world; but that the world through Him might be saved." John 3:17