To Enable or Disable the Boot Defrag, do the following:
Disclaimer: Warning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. Modify the registry at your own risk, Every effort has been made to ensure that registry edit instructions are correct and safe. FixMyXP cannot be held responsible for any damage done to your system by using this guide.
Before beginning this guide, please do this
then 
Type regedit then click 
Navigate to the following key:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Dfrg\BootOptimizeFunction
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On the right hand side, locate Enable and double click on it and give it a value of Y to enable Boot Defrag or N to disable Boot Defrag
Reboot your computer