Windows 10: will win10 accept a separate hard drive with bootable win7 on it?

In the past few days, win10 seems to have serious issues with that win7 drive plugged into the sata port?
So much so that I wiped the win10 partitions and did fresh install. Prior to the fresh install win10 refused to boot to the desktop if that other win7 drive was plugged in, error was driver stauts filure, we need to collect data type error, over and over or it refused to boot at all.

So I fresh install win10, things seem good, it is activated linked to my ms account. I shut down, plugged in other drive, bios set to boot win10 drive, win10 screen comes up, it shuts down, reboots again, shuts, down, then 3rd boot, it says is installing updates at 100% and pc is very quiet right now, for 20 minutes.

Is this even going to work?

:)

 

Win10 upgrade over 1 of 2 manufacturer-installed Win7's

Since Win10 will apparently be 'upgrade only' and not clean-installable, can I do it like this:

-- Repartition the existing hard drive

-- Install Win7 in a new partition from my factory recovery disks, so that I end up with two independent bootable Win7's

-- Install the Win10 upgrade over one of the 2 Win7's



The goal here is to allow for a staged migration of existing programs and data from Win7 to Win10, rather than the 'all or nothing' approach being forced by a lack of a Win10 ISO.

 

Product Key not accepted for windows 10 (was upgraded from windows 7)

I've had an issue(no start menu, no pictures, no access to settings) with the install of WIN10 on a lenovo laptop. (Upgraded from Win7 when the free offer came out). This was just accepted at the time

The Hard drive died and I installed Win10 from an ISO on a USB stick with a new hard drive installed. Will not accept the windows key. A friend of mine had the same issue with an Acer.

Is there a way to sort this out or will I have to deal with the non genuine windows warning?

 

ok it finally came up so it can. subsequent boots are normal speed.