So I just "updated" to Windows 10, mainly because my free update time was about to expire.
I'm having the Steam in compatibility mode problem, which mostly is stopping it from running when my computer starts up as it used to on Windows 7.
I tried the regedit thing in the first post, and there were not entries for Steam there.
I checked the file itself, and compatibility IS NOT checked.
But no matter what, it still tells me it's being made to run in compatibility mode.