So, I'm trying to maximize the game. this is the error I am getting - Sorry, your video driver will not allow you to change resolutions without rebooting your computer. Full Screen mode is not supported with such drivers,
any idea how I fix this?
Make sure your video drivers are up to date.
Look at you resolution settings for you video card and adjust them to their maximum usable your your monitor.
Usually if you change resolution settings while game is open it will be shut down and you will have to relaunch the game.
With many versions of windows changes in video resolution require a reboot of the computer.