Not only is it difficult, but some solutions work for some people and not for others. AND, VMWare doesn't have a central repository of possible resolutions; you have to dig into forums and blogs, wasting even more time. AND, they don't have a Fusion 7 patch to fix this whole mess. They want you to upgrade to Fusion 8!
They REALLY have consistently fumbled the ball on this one IMO.
BTW: I'm still dead in the water trying to upgrade my Windows 7 Ultra to Windows 10 under Fusion 7 after having tried several different possible solutions over several hours of frustrating effort. Another hour or so of this and it's bye-bye VMWare.