are you coming out with a new precision as mine wont work with my windows 10 at all anymore it just keeps saying it cant find supported device yet my video card is registered with you its the evga 660 gtx SC card.

same problem!

maybe you have to download the latest nvidia drivers or remove your nvidia drivers and install it again.
 
here you can download the nvidia drivers:

 

www
 
geforce.com/drivers

I'm not getting that error, but I did notice that the drivers needed to be reinstalled after upgrading.  
 
However, I am getting  "The program can't start because MSVCR120.dll is missing from your computer."    Reinstallation does nothing.

I'm having similar issues with Precision X on Windows 10.
 
Loading on startup takes a little bit of extra time. It displays the clock speeds, but modifying doesn't do anything.
When i watch a video in the Chrome browser with Precision X active the VRAM goes up to 95%. Everything is normal with Precision turned off and not loaded with Windows.

My pc freezes at various time while gaming or not with precision x installed, have to hard boot to unfreeze. I have tried installing an earlier version to no avail. If I uninstall precision x I have no issues, but I don't know if the gpu fan is working? ( windows 10)

yep ever since windows 10 wot is throttled dn to around 60...and have weird black flashing..used to be flawless and high fps...as far as precision x, yeah just crashes my games if it is running

5.3.8 was working for me in 10. But now 5.3.9 is not working. Does EVGA even test things.

Yep, 5.3.9  not working here also. But in task manager it is hogging 15% of cpu... I assume to load. 
 
5.3.8 works fine...
 

 
Video - youtu.be/bBwDE-YnyCE