dude try this copy/paste the following code in notepad and the save it as
.REG
Code:
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management\PrefetchParameters]
"EnablePrefetcher"=dword:00000002
Finally double clcik on it and then click on Yes ,restart n then c da changes
Hope this helps