Hi alex6500 - Welcome to the Windows 7 Forums website!
You CAN install the full Retail version of Windows 7. But first you'll have to download an ISO image file of the install DVD.
Here is a link to a page on this website for the 32-bit and 64-bit versions of either Home Premium or Professional. Sorry there is no Ultimate links however.
Windows 7 ISO – Official Direct Download Links
Just download the version you need and then use ImgBurn, which is a free ISO image burning program with a verification feature. Burn to a good quality blank DVD at no faster than 8X and use the verify feature to ensure that a good disc burn was accomplished.
Get ImgBurn at this website:
www.imgburn.com
The 32-bit versions are about a 2.30 GB download and the 64-bit versions are 3.02 GB downloads.
Then use the MS Genuine Product Key, which should be on the C.O.A. sticker on your notebook. Probably on the underneath side.
Good Luck and let us know how it worked out for you.
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NOTE:
Also remember that your product key will only work for ONE INSTALL of Windows 7! You won't be able to have the "factory version" and this version installed on the same computer and use the same key.
I just remembered you said a dual-boot setup, so I needed to remind you of that fact about the product key limitations.