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If I’m performing a an upgrade to Windows 8, do I have to have the previous version installed, or is just having the key enough?

I'm planning to upgrade to Windows 8 Pro.

I want to know whether or not will I be able to use the Product key I get from upgrade of $39.99 for a clean install later without any hassles?

In other words, is the upgrade key complete in itself for clean installs later or are there any conditions attached?

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marked as duplicate by Dave M, Ƭᴇcʜιᴇ007, RedGrittyBrick, Karan, Canadian Luke Dec 27 '12 at 22:11

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Does the upgrade need to be done on a PC with Windows already installed? The license terms for the upgrade require upgrading from a valid “genuine” version of Windows. Visit http://www.microsoft.com/genuine/ if you are not certain whether or not your PC has genuine Windows. http://www.windowsupgradeoffer.com/en-US/Home/Faq

I did this with the Windows 7 upgrade. I could not do it on a blank drive, it had to have Vista on it. However, after Vista was on it (didn't even have to boot up), I was able to select the custom install, delete and format the partitions and install Windows 7 cleanly. Whether this changed for 8 I don't know, but according to the FAQ you have a to have a qualifying base OS.

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