Game Booster is a FREE to use utility which lets you optimize you PC for better and enhanced, faster game play experience. It lets you tweak your computer by temporarily shutting down some irrelevant process and services, cleaning up RAM, removing temporary files etc.
The program cannot be closed until you switch to normal mode, so that it can restart again all the windows services and process.
It will stop some windows services which are not required at the time of game play and will also stop the running programs in system tray.