Cannot install OS X Snow Leopard due to.....

Hi, Have Macbook Pro as spec below. Want to upgrade to OS X Snow Leopard.
Purchased CD. Run CD and when it comes to choose the HD as install disk I get the message:
Mac OS X cannot be installed on 'Macintosh HD'. This disk is used for Time Machine backups.
I have used Time Machine to back up the laptop to external drive but it is not turned off.
Why am I getting this message and how can I overcome the issue and continue to install OS X.
I have taken a full back up before I am trying this.
Searched forums but as soon as I mention Time Machine I just get issues with using TM not install issues.
Any help appreciated.
Thanks
Andy

This link will help you.http://support.apple.com/kb/TS2986

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