This is a very annoying problem in Vista. Vista Explorer adapts its folder views depending on the type of files it finds there. For example, if it finds a picture it changes the folder view to iconic although you might have another files there and you don't want the iconic view, but rather detailed view. Here is a solution to this problem that fixes folder views once and for all.
Solution
* Delete these registry keys:
[HKEY_CURRENT_USER\Software\Classes\Local Settings\Software\Microsoft\Windows\Shell\Bags]
[HKEY_CURRENT_USER\Software\Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU]
* Create a new key:
[HKEY_CURRENT_USER\Software\Classes\Local Settings\Software\Microsoft\ Windows\Shell\Bags\AllFolders\Shell]
* Create a new string value:
FolderType="NotSpecified"
* Open folder options in Explorer and click "Apply to all folders" button.
* Done!
