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#591
Forget about the upgrade method if you've upgraded once already. After upgrading once, subsequent fresh Win 10 installs will be activated by hardware ID, as long as you haven't made any hardware changes. If you are using the same hardware that you used for the first upgrade - in this case the install SSD that you used to upgrade from Win 7 to Win 10 the first time - then just wipe that SSD. Repartition i, or merge partitions if there are other tiny partitions created, Format NTFS, MBR Primary - so you've wiped it clean. You mention that you have your Win 7 backed up on an HDD. So you lose nothing if you don't like the change.
Make sure you have all your current motherboard drivers. Here are the Win 10 drivers for the Gigabyte H81M-S2PV
GIGABYTE - Motherboard - Socket 1150 - GA-H81M-S2PV (rev. 1.0)
Then go to MS and download the Media Creation Tool. Windows 10
Run it from your other machine and choose to install to another machine, and create either a USB or DVD install disk - it will be a fresh ISO install of Win 10. Also I'm assuming if you've upgraded your other two machines that you know which version of Win 10 you are selecting based on your Win 7 versions.
Plug your computer in via Ethernet. Plug the newly created install USB or DVD into your computer with the freshly formatted wiped SSD, and boot it. Tap f8 to access the boot menu and select the NON UEFI install on the USB or DVD- that's important. It will show two copies on the DVD or USB - select the one that does not say EFI. Boot to that, follow the prompts to install and when it gets to asking for a product \ activation key skip it or say you have none , or whatever it asks (can't remember, but just say no\skip that and continue. It will allow you to do that no problem). Continue with the install. On the installs first reboot, be sure to catch it and pull the USB or DVD, or else you'll be stuck in an install loop. Personally I'd choose the DVD method as there have been fewer slow boot related problems post install.
As soon as the install finishes, Win 10 should auto-detect your LAN drivers, and if it does and you're connected, it will auto detect your hardware and immediately activate. If it can't connect you need to install the motherboard's LAN \ Ethernet drivers. Once connected, Windows will automatically activate based on Hardware ID.
I've done this three times already on three machines. Most people aren't aware that after you've upgraded once, even if you've upgrade from an OEM version of Win 7, you don't need to keep installing via the upgrade option, as long as you are using the same hardware that you upgraded with the first time. Subsequent installs on that same machine do not need to use the upgrade method. It is this way before July 29th or after July 29th. You could install via upgrade to get the free upgrade, then wipe and re-install Win 7 and choose to go back to Win 10 in a year. As long as the hardware is exactly the same, Win 10 will auto activate after install. No install key necessary in those scenarios.
A clean install is the best way to prevent any problems that would be occurring form cloning your Win 7 OS on the HDD over to the SSD - a bad idea to begin with even if you were only using it to still run Win 7.
This clean install method should resolve the problems.