FSautostart is one program that works great. Do a google search for it. It can be set-up so that you just click one button and it will clear your ram, stopp all the programs and services that you select for it to stop, and then start the game by its self. Once you are done the game, it will restart ALL programs and services that you stopped automatically.
Also, should you shut off the wrong thing, the program doesn't make any changes to your system, so a re-boot will put everything back to the way it was.