I just needed to reset the icon cache (changed an icon in my shell folder) and found that I needed to do these steps:
To purge your icon cache:
· kill explorer
· in a cmd window go to %USERPROFILE%\AppData\Local
· attrib –h IconCache.db
· del IconCache.db
· start explorer
And then your updated icon will be reflected in the UI.
[Update: removed error about needing an elevated command window.]