Upgrading to Windows 10 does not include graphic drivers. It will use default windows drivers, which do not support openGL properly. If you have an AMD or Nvidia card, go to the original site to download and install the latest version of the drivers.   If you only have an intel integrated graphics card, you will need to disable glsl in the compatibility options in wurm (although this can cause other issues like distorted tiles).    If you have a laptop with a nvidia or amd card you might