Start => Run => type Regedit => Enter
Now that you are in the Registry, you can change the way that Prefetch behaves by making a change in the registry. This is helpful when you want to alter Prefetch or disable Prefetch completely. Low resource (memory, hard disk space, etc) systems may need this functionality disabled to get the system to run more efficiently.
When the Registry Editor Dialog box opens, navigate to this value:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Contro l\Session Manager\Memory Management\PrefetchParameters
In the right side pane, look for the key named EnablePrefetcher. The value of this key represents how Prefetch will operate.
Values you can choose from include:
1: Application Launch Prefetch
2: Boot Prefetch
3: Prefetch everything
Simply type the number in that you want (keep all other settings the same) and click OK. Rebooting the system will give you the new Prefetch setting.