Ummmm... all default UI?

[tknarr]

If you're using the desktop icon to enter the game, right-click on it and select Properties, and down on the bottom-left use the "Open File Location" button or take a close look at the "Target" and "Start in" fields. Make sure they're pointing to the folders you think your game's installed in. I've seen more than a few cases where there was a second copy of the game installed and someone was looking at one copy but running the other.