Do you have a custom desktop UI scaling setting? Duelit needs for the windows UI scaling to be 100% for it to pick up the window size properly, as per here: https://www.easyasfark.com/forum/showthread.php?tid=130&pid=519#pid519.
It looks like you might not have VT-x enabled? You need this on for the emulator to work correctly, otherwise you can get random crashes and other issues, like slow updates perhaps. Duel Links seems to work well with 2 CPU cores and 1500M – 2GB of RAM allocated to NOX.