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I'm thinking about formatting my hard drive which is running windows 7. I partitioned it a while ago so I could dual boot with windows 8, so basically right now my drive is separated for use with both OSes.

For now I'd like to keep the windows 8 from before to have a running operating system at my disposal in case things go wrong.

What I want to do is wipe windows 7 completely and do a fresh install of windows 8, but I'm not sure if I need another license to be running a second windows 8 on the same computer.

Is this possible? How do I go about doing it? Thanks in advance.

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Provided its the same computer you can partition your hdd as many times as you want and install Windows 8 on all those partitions. Just install Windows 8 on the partition that has Windows 7 on it. –  Ramhound Jul 31 '13 at 18:04
    
If I replace windows 7 with windows 8, will I be able to use windows 7 again? Or does it get completely overridden? –  Vera X Jul 31 '13 at 18:08
    
You specifically say you want to get rid of it. If you don't want to wipe the Windows 7 parition then install Windows 8 on a different partition or simply use the Reset feature within your current Windows 8 installation ( would give you the same result ). –  Ramhound Jul 31 '13 at 18:12
    
Sorry for the confusion, I'm a bit of a n00b. By "wiping windows completely" I meant getting rid of the data, not necessarily erasing every trace of w7. What I'm asking is, if I needed to install 7 somewhere else for any reason, would that be possible (since I have my license key and all)? –  Vera X Jul 31 '13 at 18:19
    
If you are using a Windows 8 Upgrade License its not possible. If you are using a Windows 8 System Builder license its possible. –  Ramhound Jul 31 '13 at 18:45
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2 Answers

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a. Computer. In this agreement, “computer” means a hardware system (whether physical or virtual) with an internal storage device capable of running the software. A hardware partition or blade is considered to be a computer. The software is licensed to run on only one processor on the licensed computer.

based on the top of page 3 of the Windows 8 license agreement, you would not be allowed to use the same license twice even if it is on the same physical machine. you would have to buy another license.

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Provided you do not disable/format the first Windows 8 installation, then yes you need to purchase a new license to install it again. You have two active installations, you need two licenses. (Same as how you need a separate license if you run Windows 8 inside of a virtual machine)

You would go about doing this by formatting (erasing) the Windows 7 partition and installing Windows 8 on the now-empty partition. It should automatically detect the other Windows 8 installation and add it to the bootloader for you (if not, you can add it manually later).

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I don't agree he will need two licenses. Its the same computer and hdd. Unlike a virtual machine both installations cannot be used at the sametime. Of course I am willing to accept the difference between actual license and my percieved reality of things. I just view a situation like this for face value, only one installation will be used, the other likely will be wiped once the new one is working. –  Ramhound Jul 31 '13 at 18:15
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