I was highlighting text in a PDF document and I'm not sure what happened, but much of the text in the document developed a black and white checkered or pixelated appearance. I then noticed it in other programs like outlook, and drop down menus. It is even obscuring the pop up that appears when you hover your cursor over the icon for Word or any other unopened app on the task bar at the bottom of the screen. When I open Adobe Acrobat Pro, the whole welcome screen in the middle of the page is obliterated. Here is an example. I have rebooted my computer, including taking out the battery and draining stored power by holding the power button. I have ran malwarebytes and found no malware. I have scanned with windows defender and updated windows, without success. Any help would be greatly appreciated.