Im just gonna say this. I bought a BTC H81 Pro board and 6 Sapphire R9 380x cards. After everything was installed i turned the unit on. I had already installed windows 10 pro with latest updates on the SSD with no other drivers except what windows installed. With the unit hooked to the internet let windows auto install the video drivers.
After about 15 mins of downloading and screen flashing it was updated. I then grabbed my flash drive and transferred my miner by Claymore 4.3. There is a new one out but im running well with 4.3. May change over to 4.5 soon. I did not install any other drivers for the mother board or download any specific driver for the video card. It does show to have installed 15.11 driver but is running stable for more than 3 weeks at 128.9mh. I have since bought two more rigs another exactly the same and one that has 4 MSI 380 cards.
The driver installed for the MSI cards is the 15.12 driver. Im not sure why it picked these drivers but i have had no issues. The MSI is running at 20.1mh with a slight over clock in After Burner. Lots of talk about specific drivers but i found this worked best for me. If you can do a fresh copy of windows 10 and this is a driver issue this may fix it. I did have an issue this morning with a hdd i was using. It would start mining for about 30 secs then it would disconnect from the internet. I tried for an hour before swapping hdds with the SSD in the other rig. It booted and worked perfect and has been on since about 6 am without issue.
This hdd is an older drive i had laying around. It could be failing but i think it was from trying to install all the drivers as suggested from around here. Im not saying anyone is wrong but my other units are working 100% without any problems. This maybe far from your issue but just wanted to give this info just incase.
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Good luck