Windows Vista and Seven defragment system files every time you boot your PC. If you often defragment your hard drives, this automatic feature is unnecessary
and it slows down the launch of Windows. To disable it, you must modify the Windows registry.
Implemetation
Open the Registry
Start/All programs/Accessories/Run
Type the command regedit
The Registry Editor opens in a new Window.
Expand the key: HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Dfrg>BootOptimizeFunction.
Right-click on the keyword "Enable" and click edit
In the Value data field type, N
Confirm by OK
Right-click on the keyword "Optimizecomplete" and click edit.
In the Value Data field, replace Yes by No. (case sensitive)
Confirm by OK
Close the Registry Editor. Changes will be effective upon restarting Windows.
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