This is a batch file that turns off several Windows XP services that may inhibit your system performance while playing games, or while your PC does other high-performance tasks. "Stopservices.cmd" turns them all off. You can download the "Startservices.cmd" file if you want a single command to turn them back on again; Otherwise, you can just reboot your PC and the services will be back the way they were when Windows restarts.
You can customize each file by right-clicking the file and selecing the Edit menu command. To run the files, move them into your C:\Windows\System32 folder, then click Start, Run, and type either stopservices or startservices, depending on what you want to do.