Hi,
Well... Speccy will give you an extensive list of all hardware in the pc. With that information we can go 'driver hunting'. ;-)
There are lots of people running Win10 and Softimage, so you're not alone. Why one has no issues and the other has, is always hard to debug.
But Win10 is very driver sensitive, so updating to the latest ones is always the first to try. All your hardware is pretty standard, so unless it's hardware related it hopefully can be fixed with updates.
Take care, and when you have time again, we'll pick this up again.
rob