Installing Media Direct and Windows 7 on an Inspirion

Have a 1505 inspirion Dell dual core. The laptop powers on Media Direct on the left and POwers on os on the right. I've installed windows 7 which takes up full bios. To get media direct installed CORRECTLY do I have to wait until the final windows comes out and then install Media Direct First or can I still go into the bios and install it so I can use the media direct power button and avoid the os?

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