PC Accelerator XG ($29.95), a power tool on steroids, includes over 400 settings (some are OS- or application-specific)—more than most of the other programs we tested in this section. A wizard can recommend settings for your machine, or you can dig through page after page of check boxes. Since many of these settings modify the Registry, PC Accelerator comes with Registry backup and restore capabilities. An HTML-based help file gives spotty details on all of PC Accelerator's features. The program also comes with utilities such as a monitor calibrator, which displays a special gray scale and instructions on setting contrast. PC Accelerator's myriad settings can provide endless hours of happy tinkering.