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HLM\System\CurrentControlSet\Control\Class\{4d36e96a-e325-11ce-bfc1-08002be10318}\0000
New Dword "EnableUDMA66" or "EnableUDMA100"
Set it as 1
Restart
i suppose its already made on auto mode while you see your bios settings its something called DIRECT MOMORY ACCESS
mark me as answer if u think i am right