Okay alot of us know piggy's winlag is glitchy on XP, so heres how this works, it achieves a very similar effect, it gives enough lag to stop gameobjects form loading as you move, so that you cna go through gates etc.
step 1: Go to programs>accesories>system tools>Disk defragmentor
step 2: hit defragment, when it finishes analyzing, it wills tart lagging Wow, so that you can move fine but not load everything.
step 3: enjoy, defragmentor also helps improve PC performance.