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Defrag Your Computer to Speed up:
To defrag your hard drive with Windows XP, go to:
* Start> Programs> Accessories>System Tools> Disk Defragmenter
Other Windows operating systems has the disk defragementer tool in a similar location.
If you can’t find it, go to Windows help and search for “defrag” to find out how to run it.

Clean Temporary Files To Speed Up Your Computer:

Windows write files all the time to your hard driv and it will leave old temporary files there. Windows XP comes with a handy program that cleans them up. To clean up temporary files on your hard drive with Windows XP, go to:

* Start > Programs> Accessories>System Tools> Disk Cleanup

For other Windows operating systems you may have manually remove temporary files. To find out how, go to Windows help and search for “temporary files”.

One of the best tool i use is system mechanic
Over 98% of PC problems are caused by clutter and faulty settings that are the result of everyday PC use.
System Mechanic automatically repairs errors and fragmentation, cleans out clutter,
and tunes up your PC — so that it runs smoothly, reliably, and up to 300% faster!
Tune up your entire system, clean up clutter, and fix hard drive errors for better speed and reliability.
Improve your gaming experience.
Boost your PC to play the latest high-performance games at maximum speeds.
Speed up internet access.
Accelerate download and web surfing speeds up to 300%.
Version 8 has several other new features, including a New Visual Registry Optimization Tool that graphically shows and removes the RAM-wasting bloat and fragmentation that’s left over after a registry is cleaned of errors, and DriveSense?, a cool new visual “window” into the status of your hard drive.

You can also use one more tool CCleaner

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