Improve System stability
Key: HEKY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\Curr entVersion\
Create a new DWORD value called AlwaysUnloadDll and set its value to 1.

Speed up Explorer
Key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Contro l\FileSystem
Create the DWORD value NtfsDisableLastAccessUpdate and set it to equal 1.

Speed up the start menu
Key: HKEY_CURRENT_USER\Control Panel\Desktop\MenuShowDelay
Double-click on MenuShowDelay and look at the Value Data. Set it to 100.(default=150)

Tweak The Prefetch

1. Run "Regedit"
2. Goto [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Contro l\Session Manager\Memory Management\PrefetchParameters\EnablePrefetcher]

3. Set the value to either 0-Disable, 1-App launch prefetch, 2-Boot Prefetch, 3-Both ("3" is recommended).

4. Reboot.

It will decrease the boot time but double and increase the performance of your XP.
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Just copied this from another forum, but I do not know how to do this can anyone here help me...BTW, do these tweaks work? TIA