If you wish to no longer play your game in a full screen, you can easily disable this feature by following the quick and easy steps below:
Find the shortcut for the computer game you want to play in windowed mode instead of full screen.
Right click on the shortcut, select Properties.
In the Target field add: -w at the end.
Click OK.
If at any time you no longer wish to play in the windows mode, and want to go back to the full screen mode. Simply remove the -w from the Target field.