Slow down, I'm not saying it's because of DRM, I don't have a clue, as I'm not from larian studio smile

I was just checking, as that sounded like a DRM-linked problem.
Have you contacted support yet ?

http://www.larian.com/d2_support.php

Even if the larian dev roam quite a lot through the forum, they can miss topics, but most times they asked for the dxdiag, sometimes for a savegame.