Recently I was trying to restrics "delete" permission for usual users. To do that, I've done the following:
(translating from Polish Win version, may be small differences) Right mouse click on given directory -> Properties -> Security -> Advanced -> Change permissions -> I've unmarked first checkbox to stop inheriting permissions from parent dir -> I've added special permissions for users - "Delete" and "Delete subfolders and files".
As a result I cannot delete these files/directory as a normal user, it's asking me about admin password - it's great, as I expected. However when I input admin password, file is not deleted and there is an messabe box informing, that I need admin permissions to perform this operation. Also, when I try to repeat these steps for admin, it gives me the same result, I cannot delete files/directory on which I performed above changes, even when I'm logged as admin account on which I performed these changes.
Can anybody help me solving my problem? I don't understand, why denying delete permissions for users makes it impossible also for admin user...
To answer your first questions, hidden Administrator account was disabled and I was not using it, just used my admin account.