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.