I only run in full screen.
Also my previous post saying how well the game ran for a day. This morning it ran like total crap, CPU very high on usage, taking forever to load NPCs/quest turn ins, etc. This time I could really tell it was going to happen. Nothing was loading as I was on my mount. Eventually hit a lag wall (unable to walk through a certain point on the map). Sometimes I can turn around and the wall is gone. This time, turned around came back, things still not loading. Bang, C++ error. Again...