Can I reinstall Windows 7 on Boot Camp with the same product key?

I have run into some issues with my Windows partition, so I want to reinstall Windows 7. I have a genuine copy of Windows 7 Ultimate Edition.
What I wish to do is to completely remove the Boot Camp partition, and then create a new one and install Windows 7 over it. However, I have only 1 product license key. When I reinstall Windows 7, it's going to ask for the product key, whih is obviously going to be denied because I have used it.
Is there any way I can acquire another key for this purpose? I am willing to pay a small fee, but I am definitely not willing to pay the full amount for a new Windows 7 copy.
Furthermore, and a little off-topic: Does anyone know if there are any compatability issues with the Windows 8 dev edition and Boot Camp? Can I use the support software for Windows 7? Will it be able to take advantage of the hardware? Will I get sound and internet? Will I be able to scroll with my trackpad?
Thanks.
[EDIT] I forgot to mention that the main reason I have to create a new partition instead of just Custom Installing over the previous one, is because I require a larger partition size.

Thanks for your help!
Not to be a pain, but I just want to clarify some things.
The hatter wrote:
The retail version can be reinstalled as much as you want, even to a new computer (just not two at same time)
Yes it will activate just fine on reinstall. Not an issue.
Let's assume I do not have issues about reallocating disk space, and just want to re-do my whole partition. Here's what I would do. Please tell me if it would work fine, or if I would hit a snag somewhere:
Have original retail W7 disk at hand (the one I previously used for my first install).
Remove existing partition using Boot Camp Assistant.
Re-install using the said disk.
W7 should activate without a problem, even though I've used the license before.
Do I have to do anything on Windows before re-installing it to "deactivate" the copy (or something along those lines) before I can re-activate successfully on my new install?
And what is System Builder?
Thanks for all your help!

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Edit
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Message was edited by: NA Smith

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TEST-imaq-line-fit-86.vi ‏169 KB
IMAQ-Fit-Line-Problem-86.doc ‏230 KB

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Can I reinstall Windows 7 on Boot Camp with the same product key?

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