What is the best way to speed up an older PC? I know about deragging, and adding more RAM, and wiping out a hard drive and reinstalling XP. I've done all these. Would "XP Tweaks" be recommended? I am technically competent, but I would be hesitant to try to edit the registry or mess with the bios. This is for an old Dell Dimension 4100 that I'd like to set up a my kids' internet PC. Thanks to all.