I don't really expect that anyone here is able to help me, but asking more people doesn't hurt. I'll just copy my post from the official Witcher 2 forum.
[SPOILER="Spoiler"]Hello,
I have the Problem that my version of Witcher 2 Enhanced Edition completely stops working every other minute for a few seconds, resulting in a black screen and an apparent texture reload right afterwards.
Here is my dxdiag.
Here are my game settings.
The GPU drivers have been updated yesterday. A temperature check with HWMonitor revealed nothing extraordinary, with the GPU reaching 90°C and the CPU cores reaching ~70°C each, and the case and coolers have been cleaned very recently.
It takes a while to occur for the first time, but after that it happens frequently. I also had a similar problem with Skyrim when I reinstalled it, it would throw me back to desktop without any error message after running around in the world for a bit. Interestingly I had no problems with it during one session.
Additionally even the lighting in the Dark Mod map Crystal Grave at one point caused a severe drop in framerate, but I haven't checked yet if the problem persists.
I'm very confused by all this.[/SPOILER]