A great new feature in Microsoft Windows XP is the ability to do a boot defragment. This places all boot files next to each other on the disk to allow for faster booting. By default this option is enabled but on some builds it is not so below is how to turn it on.

Start/Run/Regedit

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Dfrg\BootOptimizeFunction
Select Enable from the list on the right. Right on it and select Modify. Change the value to Y to enable and N to disable.
Reboot your computer.


Also see HKEY LOCAL MACHINE\SYSTEM\CurrentControlSet\Control\SessionManager\Memory Management\PrefetchParameters and EnablePrefetcher = 1 application launch prefetching, 2 boot prefetching
add the numbers

Also
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Dfrg\ "Enable"="Y" (Y = defrag will optimize for boot and app launch)