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Using Windows Explorer in Windows Vista is sometimes annoying and confusing as the folder views settings and folder types customization is not working consistently. Folder views which determines which view, such as tiles, details, list, small icons, medium icons, large icons or extra large icons, that users is using to browse files and items in Explorer window, while folder types set the template which shows kind of folder and its related commands and buttons in toolbar. However, the implementation in Vista is buggy, messy and abnormal.
The easiest solution all Folder Types and Folder Views mess in Vista is by reset all settings and customizations related to Folder Types and Views to revert back to out-of-the box post-installation defaults. Note that you should try to use Reset Folder in Folder Options (open by clicking Organize -> Folder and Search Options and then go to View tab) before trying registry hack below.
Registry tweak below will delete and reset all folder view and folder type settings to default and clean state by rebuilding the related registry key, so that every start fresh again from scratch. All remembered folder settings in Windows Explorer for view state, window position, sort order, column information, folder type, toolbar toggles, and search result views will be lost, and reset to the original defaults.