I encounter this every now and then, usually when trying to uninstall drivers or something like that. The general sequence is this:
1) Try to delete a folder. Get "You need admin!" message. Even when I am admin and/or click the shield icon.
2) Enter the folder.
3) Select and delete the entire contents of the folder, barring any hidden files that I didn't get caught in the select. No prompt for Admin.
4) Leave the folder.
5) Delete the folder. No prompt for admin.
I must be completely misunderstanding the security model of window, because from how I understand things, this doesn't make any sense. What is going on here?