Well, I successfully installed Thief ( v1.14 ) with low settings. I could play the game but after a few minutes it starts to freeze.

It says "Thief requries 100% DirectX 6 compatible drivers for your video/3D card..."
My version is DirectX 11.
What seems to be the problem?

I'd be happy with any help! I really missed out on a lot of classics and all of them look very enjoyable.