I'm gonna guess its snake oil. Love em or hate em, Microsoft did a pretty good job with XP (I won't say the same about Vista). Theres very little you can do w/ memory management, registry settings, etc, and make it faster than what MS already did. I would recommend you give yourself enough memory (1GB, maybe more if you don't mind the hibernate times), don't install worthless programs, don't let unnecessary programs run at startup, and don't let your computer get riddled with spyware. my computer gets junked up over time and a good reformat/reinstall always fixes it, and right after that the machine screams until it starts filling up w/ junk that i end up never using. i didn't let that happen w/ the car computer, and its pretty fast.