I've allready tried a clean re-install of Skyrim, without any effect though, so I guess it either has something to do with the .ini file or with my save files.
On a related note, whenever I try to enter the inn inn in Markath the game CTDs, a problem that wasn't fixed by the clean reinstall either, so it also could have something to do with the ini. file or my save files.
Does anyone know a solution to this? Perhaps a way to check wether a save file is corrupt and fix it if necessary?