Hi Dercum,
Thank you for choosing Microsoft Community!
Let’s follow these methods and check if you can open minesweeper game in normal screen.
Let’s reinstall Minesweeper game from Windows Features.
Refer this link to open, Windows features on or off
http://windows.microsoft.com/en-US/windows7/Turn-Windows-features-on-or-off
In Windows Features, expand Games, uncheck Minesweeper, click Ok.
Restart the computer, Now go to Minesweeper, check the box and click Ok.
Hope this will be helpful. If you still have further queries, please reply us and we will be happy to help you.