I replaced Win8.1 Pro with Win10 Pro, but I haven't installed FSX or P3D in it yet.

As far as I can tell, you can opt out of the scary stuff that is a threat to our privacy, and I did them. Checking online, there are a lot of sites that can tell you what to do to turn that scary stuff off. Either during the installation, or after it has been installed.

I think I did something wrong during the upgrade, so I'm planing on reinstalling Win8 Pro (Win8.1 Pro was a free upgrade for Win8 Pro), then upgrading it to Win10 Pro using a "clean install" to make sure the partition doesn't end up like it is now. :(