After doing the usual with the BIOS I attempted to install Windows 8.1 from a bootable USB flash drive. However, the opening W.8.1dialog box, (language, etc.) was so small I had to use a magnifying glass to read it. And more importantly I could not get it to operate when clicking on OK. My intentions were for a dual installation of W.10 & W.8.1. Any ideas as to what is causing this? Thanks for any suggestions.