Enable or disable boot defrag
Start Regedit. ( Open Start, click to Run and type "regedit" to command line )
Navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Dfrg\BootOpt imizeFunction
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.
