Improve Your PC Perfomance

1. Right click on Desktop > Select New > Click Shortcut
2. Type: %windir%\system32\rundll32.exe advapi32.dll,ProcessIdleTasks and click next
3. Then, put any name to the shortcut we've been created, ex. Maintain Memory
4. Click Finish and double-click on the shortcut
5. That's all.. See the difference...

Another Useful Tweaks for Windows XP:

Click Start > Run > Type: msconfig > Click Ok, Click SYSTEM.INI > Click [386enh] > Click new > type: RUNConservativeSwapfileUsage=1 > Click apply > Click Ok > Restart your computer > and Enjoy improved and fast processing speed and better Gaming performance...

Source: Link

This doesn't work for everyone. This didn't work for me when I tried this. My friend did this though, he said it helped but only by a hair.