Windows 10: uninstall win 10 back to win 7 home premium win wil not run my quickbooks pro

I would like to uninstall win 10 back to 7 home my quickbooks program and it"s files will not run

:)

 

Windows 7 Home Premium to Win 10 Pro

Currently running Windows 7 Home Premium. Although 90%+ use is business the version was selected for Media Center. With WMC going away I would like to upgrade to Windows 10 Pro rather than home. I understand the "Free" upgrade from Win 7 Home Premium is
to Win 10 Home. Is there a path to Win 10 Pro? Free or otherwise.

 

Uninstall Win 7 upgrade

I recently upgraded one of my Xp rigs to Win 7, and i did a clean install [custom install > full] but gave me an option to install Win 7 on my secondary HDD which i did, but now i just want to go back XP since i don't really need win 7 on that rig. Weird thing is that when i boot [from my XP HDD, as selected by BIOS] I get the option to choose either OS, even though the Win 7 OS is on the other HDD.

Quick question:
How could I uninstall Win 7 from my secondary HDD, without affecting my primary HDD, since [i think] some of the Boot files of Win 7 are on my Primary [XP] HDD.


-New to 2 OS'es on one machine *Eek!

 

Win 10 Pro Free Activation with Dual Boot Win 7 Pro

I have Win 7 Pro installed

I have installed Win10 Pro from ISO to separate partition

Dual boot is working fine

If I use my Win 7 Pro Activation Key to activate Win 10 Pro I have the following questions:

Will Win10 Activate for free?

Wil Win 7 continue to be usable?