These freewares might interest you Arizona:
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GAME BOOSTER:
Game Booster | Fast Game Accelerator | Free Accelerator
I haven't tried it. Works for all versions of Windows from 2000 to now. You can choose the setup to suit you. Completely safe judging by cnet & other website reviews.
Publisher's description from IObit: Designed to help optimize your PC for smoother, more responsive game play in the latest PC games with the touch of a button, Game Booster helps achieve the performance edge previously only available to highly technical enthusiasts
It works by temporarily shutting down background processes, cleaning RAM, and intensifying processor performance
That means you can keep all the features of MS Windows ready for when you need them, but turn them off when you are ready to get down to serious business - gaming"
Game Booster - Free software downloads and software reviews - CNET Download.com
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GBOOST
GBoost Home
It's new, but in beta & I wouldn't touch it myself because your system is checked remotely to allow gbooost to best decide how to optimise