Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
For starters you could try changing your date and time to what it actually is.
Then you should uninstall whatever it is that's generating that pop-up, because that's not windows.
I don't see any way you could get that error, unless you ran some linux distro(ubuntu?) in virtualbox seamless mode.