Speed up PC and fine tune for performance

Hello,
how to speed up the PC and tune the PC for best and quick performance. i have tried with cleaning registry, clearing temp. files, cleaning desktop, nod32 AV updated, protected by spyware n pishing, msconfig selective startup and defragmenting the drives but still its slow. when i install fresh XP with all the programs needed it will work fine for few days and again its going to slow mode

Try the following ways. Should tune your PC up more or less.

1) Remove Unwanted Programs.
2) Delete Any Clutter / Junk Files.
3) Clean Out The Registry.
4) Disable automatic startup of some programs.
5) Defragment your system.

Also l recommend a PC speed up tool to you, which can help you easily and instantly speed up your PC with just a few clicks. Good luck. Here to download: http://www.anysoftwaretools.com/speed-up-pc.html

Move the pagefile to its own partition. Try a program like deepfreeze.That way it will always run like its a fresh copy Shutdown services you don't need. Instead of installing winxp try Xp lite.....Switch software. To lightweight version maybe open source software in stead. Finally move away from windows to *unix or bsd ... The last one is optional...