The only thing that fixed this for me was flashing the stock image of windows, which can be found at the below links. I tried multiple drivers and was not able to get anything that would fix it otherwise.
http://www.teclast.com/tools/pad/pad.php
You’ll need to enter your model number in (google translate will help navigate). Jdownloader may be needed to download the files as well.
Someone has also rehosted them here:
https://mega.nz/#!WcwSGbKY!1VCWW1v4ShVH8j7EoCuF6XskIpayAvn9p4o8LDuQnVM
https://mega.nz/#F!3cVGEK4Y!9kevj-F1cBuMI4lBzYCa1w
