What windows 7 license to buy?

I did a 'clean' install of Windows 7 Pro onto a Dell laptop. It previously had Vista Home Premium but I formatted first. I did not activate the license since I had already used the license on another PC. I have 30 days to supply a license/product key.

I do not want to reinstall. What license should I buy?


Windows 7 Pro requires Windows 7 Pro license key.

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