Here is what I did: I use linux installed on my SSD. Lately I've decided to install windows 7 on another separated HDD (non-ssd) and upgrade it to windows 10. So I temporary disconnected the SSD with linux installation and installed windows 7 on the other hdd which I formatted before installation. Then I upgraded windows to the latest version. Everything worked fine until I connected the SSD with linux back to my notebook. if the ssd is connected to the computer, windows always completely freezes at random time after login process (Only thing I can do is hold power button to turn of the computer).
Note that I haven't changed sata ports on which both drives was connected at the beginning of process.
I'm sure that this is not hardware issue.
Note that I tried turn off fast startup option in power options.
The SSD on which linux system is at, is formatted to ext4. HDD with windows system has ntfs filesystem.
HDD with windows installation is set up as first boot option and is connected to sda.
With this setup computer automatically boots to windows. if I want to boot to linux I have to hold ESC key before boot time and choose the SSD as boot option. (I hate this behavior but it's only thing I could think of to help windows boot properly) This really makes me absolutely crazy! Do you have some ideas how to solve the issue?
Would it change anything if I would rollback windows 10 upgrade back to windows 7?
UPDATE:
After @Michael's answer which unfortunately did not make any difference I spent several hours with testing the behavior. I tested the following scenario multiple times in row and it always behaved in the same way:
HDD = hard drive with Windows 10 Pro 64bit (BUILD 10240) installed in it (not UEFI)
SSD = solid state drive with Xubuntu 14.04 64bit installed in it (not UEFI)
So I started with only HDD connected to the computer and as expected in this state Windows never freeze.
Then I connected SSD but again booted to the HDD with Windows in it. Windows also doesn't freeze in this state. I continued and restarted the computer and booted to the SSD with Xubuntu in it, after I logged in, I shut down the computer and tried to boot to Windows again. This time Windows always froze before or during login process and usually ended up with blue screen of death after while of waiting.
After this I followed up with trying to boot to Windows again several times.
Result was that Windows always froze AFTER login at random time (it didn't freeze immediately, it was running couple of minutes without an issue until it froze...) until I disconnected SSD then it was possible to ran Windows smoothly again.
Note that Windows doesn't freeze if logged in safe mode (at least it didn't happen to me during the time of testing).
Conclusion:
Linux edits something related to boot sequence every time I boot to the Linux which keeps Windows from booting properly after then.
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