wow.exe not found

[Erurainon]

I went to log in tonight and auto downloaded the 2.2 patch. After the download I got a message pop-up that said wow.exe could not be found. Now, if anyone recalls I initially had problems with seeing the Addons button because I'm using Vista. Is there something special I should be doing at patch time? Like moving my wow directory out of Game Files and back to Program Files? If this is the case, how do I protect my UI and addons folders from the new wtf folder that is sure to be placed in there by the patch? I've not had to mess with it in a while, so I forget the details...