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I'm trying to install Windows 8 Pro RTM on top of a Windows 7 Ultimate, but the only option I get when asked "Choose what to keep" is Nothing, which seems rather drastic.

A friend of mine tried to do exactly the same thing and was actually allowed to keep all settings and applications, which is exactly what I want to do.

Both Win 7 Ultimate and Windows 8 are genuine, and the keys are valid. I've tried using a Windows 8 instead of a Windows 8 Pro key on the setup but the outcome was the same.

My exact version of Windows 7 is (from winver):

Windows 7 Ultimate
Version 6.1 (Build 7601: Service Pack 1)

I've tried running the setup from a Daemon tools-mounted iso, from a bootable usb stick and unpacking the iso image onto a folder (on a different hard drive than the current installation) and running the setup from there.

Any help/ideas on the matter would be appreciated.

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I wonder if it's because you're going from Ultimate to Pro, which is technically a downgrade, edition-wise? I'm guessing. I've installed 8 so many times the last month my head is spinning. – user3463 Aug 18 '12 at 8:13
    
I upgrade from Windows 7 ultimate to Windows 8 Pro, so this shouldn't be a problem, see also: en.wikipedia.org/wiki/Windows_8_editions – Andrew Flierman Aug 18 '12 at 8:55
1  
Did you move your profiles off the system drive? Windows NT 6.x doesn’t allow you to upgrade if you do this. – kinokijuf Aug 19 '12 at 4:51
1  
@RandolphWest I went from Ultimate to Pro and was able to keep everything. – Louis Aug 19 '12 at 5:10

Ok, problem solved: The issue seemed to be that I had moved my user profile from C:\Users to D:\Users. That caused the installation to be unable to keep any of my settings.

After moving my profile back to C:\Users I do get the option to keep all my settings and applications in the setup. I'll have to move it back out of C:\Users again after the installation though since my main drive is a not-so-large SSD. Oh well.

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How did you managed to understand what was the problem ? – Nison Maël Sep 14 '12 at 4:09
    
@Nison, I looked for setup*.log files, and in the fileI foind, I searched for "compatibility scan." an "hardblock". It wasn't random searching, Scott Hanselman himself helped me along :) – Sergi Papaseit Sep 14 '12 at 8:18

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