Tweak3D.net - Windows XP 15 Minute Tune-Up
A fine-tuned Windows XP PC can run quite fast even it's seriously lacking in the memory and CPU department. Before you chuck out your PC to buy a new one, try stripping some of the rust that's built-up over the years; the results may surprise you.
It's probably your operating system that's slow, not the PC. It's software, not hardware - you know, invisible 1s and 0s held in an electric field representing your data. Your computer is still fast, but there's a ton of stuff slowing it down. There's more 1s where there should be 0s and your PC is killing itself fighting an impossible battle to burn off this fat.
We've seen Pentium II machines with 128 MB RAM run XP faster than Pentium IVs with 4x the clock speed and 4x the RAM - so what gives? This article will help you figure out why your PC is running slow and outline exact steps to fix it quickly, before throwing in the towel with a format, restore, or new PC purchase.
Hat tip: Lifehacker