Unless you have a very marginal PC where you're hitting swap while playing, gamebooster and their ilk are placebos.
My machine is getting close to replacement - i7-920 and GTX295 with 12GB RAM. I run 3 virtual operating systems ontop of my Windows 7 which are largely idle if I'm not focused on them. Regardless of whether I shut down those OS's or not, there's no noticeable difference in performance. Stopping a couple of services (which are likely sleeping anyway) to free up a few MB of RAM doesn't even come close to the resources required to run an XP and 2 Linux VM's as I do.
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