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Go into registry editor, regedit.exe
Move to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management\PrefetchParameters.
Double click "EnablePrefetcher".
Set to the number that corresponds with what you want: 0 to disable; 1 to prefetch only application files; 2 to prefetch boot files only; 3 (default) to prefetch both application and boot files.
Click OK and reboot for your new settings to take effect.