Windows XP includes an option to perform a boot defragment, which places all files required for booting next to each other on disk to provide a faster boot time. The OS enables this option by default, but you can check the status and enable this option by performing the following steps:
Start the registry editor (regedit.exe).
Navigate to HKEY_LOCAL_MACHINESOFTWAREMicrosoftDfrgBootOptimizeFunction.
If Enable isn’t set to Y, double-click Enable and set the value to Y.
Click OK.
Close the registry editor.
Reboot the machine.
If you want to disable boot defragment, set Enable to N.