All this being the case, you will probably have to do what I do on my laptop and my Aunt's. Do a fresh install of Windows 7 and get it activated and all your hardware installed. Don't worry about doing all the Windows Updates, just make sure you are on Windows 7 SP1 (even if you have to download the stand alone package).

Then, once all the hardware drivers are installed, using a Windows 10 DVD, upgrade to Windows 10.

Once completed, you should be able to install the AMD Crimson Beta Driver, which was the last driver and only version of Crimson for the 5XXX and 6XXX GPU's.

It's a pain, but it has worked for a couple of laptops that have few to no Windows 10 drivers.