The easiest would be to keep your game in your Downloads or Documents folder. Desktop is also an option, but that would just clutter up your desktop eventually and then you'll have to clean or reorganize it at some point.
The important thing NOT to do, is not to put your game directly onto your C: or any other drive, not into your Program Files, Program Data, Windows or any other system folder that needs admin rights to write into. If you do that, then you will also need admin rights to run the game and that is generally not a good idea.
In case you already have done just that, then you could copy the game folder from the "wrong" place and paste it into your documents or downloads folder. You could create a new folder named GAMES or something inside your downloads or documents folder and use that for all your games. And, after you have tested your game in the new location, you can delete it from the old one.
Of course, there is a countless number of other options, including an option to keep your games in one of the very "wrong" places, but that would mean that you'd have to change NTFS permissions of your game folder and that could be a challenge for a "computer illiterate".