1. Start Registry Editor (Regedit.exe) and locate the following key in the registry:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Sessi onManager\ MemoryManagement\PrefetchParameters.
2.On the EnablePrefetcher value, change the setting from 3 to 5 (decimal).
3. Close the registry editor and restart your computer.
"Windows XP Tips: Memory Tweak "
Reference : techpraveen.com
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