Somewhere in the last few months the common Open File Dialog in my Windows 7 install started getting corrupt. More specifically, the folders on the left-hand side and the main window folders & icons show the default "missing icon" visual. Folders with a desktop.ini (like Project Docs under favorites) seem to show correctly.
I've deleted my thumbs.db and restarted explorer.exe, and I've run sfc.exe. Neither did anything.
Any idea what's going on and how to fix Windows?