Am i able to reinstall windows 7 onto a new harddive in the same computer?

basically i have windows 7 installed on my computer right now. I have the full OS, not the upgrade. I want to upgrade my 320gb harddrive to a larger size. Will i be able to install windows 7 on a new harddrive with out any problem or will Microsoft tell me that the key has allready been used?

cool, thank you

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