Not at home right now to check how mine is set up but you may want to try and set teknoparrot to run as administrator and for full screen I know for some games you have to check the windowed box in the teknoparrot game settings.
So checking my settings back home now I would leave it unchecked for windowed. One thing to possibly try is setting your scale to 100% as I see it is currently at 300%. Other than our display resolutions that is the only difference I am seeing. To get rid of the pop ups I am pretty sure I had to set teknoparrot to run as administrator. To do that you go to your Teknoparrot folder and right click on the executable file and click properties. Then click the compatibility tab. Check the box for Run this program as an administrator then apply and save. You definitely DO NOT need to reinstall anything or start over with anything.