Help installing Windows 7 and Dell Media on other side.

I have a E1505 laptop that powers the media center on the left. and powers the os on the right. To install media center I was told that would have to install first and then the os. Assuming I install windows 7 this fall how will I get the media center power button to work correctly or in other words how do I partion this.

Didn't the os ask for the partions (I told it to clean install and 100% went to winows 7 rc). If I were to do a clean install now how would I seperate the partions correctly. Thanks.

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