I currently have MM6&7 on GoG and MM8 on disc, playing on windows 10. I can get the games to "work" fullscreen with the exception of several bits of the HUD cut off - as in several IMPORTANT bits. All I ask of GoG is to get this shit fixed up so I can play these games.

If you are asking GoG to fix something contact support. They don't read the forums.

As for your problems, try the suggestions in this thread.

https://www.gog.com/forum/might_and_magic_series/mm8_screen_resolution_interface_too_large_for_screen

quite frankly, I don't know enough on how to work this stuff to figure it out so if I can get a step-by step guide, that would really help

Do you know what graphics card are you using?

Graphics Chipset
AMD Radeon(TM) R7 360 Series

Here is a step by step guide:
http://support.amd.com/en-us/kb-articles/Pages/UnableToSetGPUScaling.aspx

Scroll down to "Accessing Scaling Mode in AMD Radeon Settings"

Under scaling mode, select "Maintain aspect ratio"

tried and still has the damnable cutoff. so obviously NOT the problem

Did you trythe other options. If that still doesn't work then I'm out of ideas sorry.

Either way contact support.

i dont have this problem. runs fine full screen here, win10 nvidia 980ti.
maybe its specific to your card..or something..but not a general problem with win 10. just saying they probably havent fixed it because they arent aware of it. hope you get it working tho.
Edit: runing it at 1080p. dunno what res you are trying to run it at

the support really doesn't do shit regarding might and magic anymore, all you will get is the support quoting parts of these forums.

ok I can run MM8 in a window just great, but 6 & 7 are not allowing me to. it keeps saying I need to run in 16 bit color, and when I do, it runs horridly. I've manage to trace the problem to the "compatibility settings" but can't turn off the setting for some stupid reason