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Windows 7: Install win8.1 from win7

09 Nov 2013   #1

win 7 pro x64
Install win8.1 from win7


I'd like to install win 8.1 on a different hard drive along with my current win 7. Can I simply mount the win8.1 iso (daemon-tools) and install it from win7, or do I have to burn a dvd first?

My System SpecsSystem Spec
09 Nov 2013   #2
Bare Foot Kid
Microsoft MVP

W 7 64-bit Ultimate

Hello zoharl3.

Have a look through the information in this tutorial at the link below for some additional ideas and be sure to post back with any further questions you may have and to keep us informed.

Dual Boot Installation - Windows 8 and Windows 7 or Vista

My System SpecsSystem Spec
09 Nov 2013   #3
Mellon Head

Win 7 Pro x64/Win 10 Pro x64 dual boot

I think I would just do a clean install to a blank drive. That's what I did. It lessens the chance of mucking up Windows 7 and it will still dual boot. I wouldn't do it from inside Windows 7. Too much room for error.

That's just me, though, YMMV.
My System SpecsSystem Spec

09 Nov 2013   #4
Microsoft MVP


Always make bootable install media which may also be needed for booted repairs.

And always unplug all other HD's before booted OS install.

Best method to burn the ISO is using ImgBurn at 4x speed.
My System SpecsSystem Spec
09 Nov 2013   #5

win 7 pro x64

Okay, it worked (mounting iso and installing within win7). The key was to run setup.exe from sources folder and not from the root.

Since I later decided to switch between my primary and secondary harddrive, I needed the installation disc to activate the new partition and make it bootable (diskpart, bootrec...).

Thanks for the links and tips.
My System SpecsSystem Spec

 Install win8.1 from win7

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