Boot defrag speeds up the startup process by placing the boot files next to each other. Some users may have this enabled already by default, but some have also noted that this is not the case after they had upgraded Windows. To enable this process:

1. Go to "Start-->Run", type "regedit" in the box and hit enter.
2. Navigate to "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Dfrg\BootOptimizeFunction"
3. Select "Enable" from the list on the right.
4. Right on it and select "Modify".
5. Change the value to "Y" to enable and "N" to disable.
6. Reboot your computer.

   Ensure that you run a backup of your registry before making any changes.