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#11
If the first partition ahead of the 7 primary is removed entirely you would need to boot from a live GParted cd and proceed to move the entire primary to beginning of the drive. That will take some time but preserve the installation already on it.
The time saving method however is simply back everything you want up to another drive or removable media and simply nuke the drive in preparation of a clean install of Windows. Once you have 7 on a new drive there you will likely end up nuking the present drive for use as a storage device if you don't have any plans for dual booting the two flavors(32bit, 64bit) of 7 there.