You are not authorized to delete files in Windows.

In Vista and Windows 7, right-click the folder or file to be deleted-properties, and click Security-advanced-owner.
② Edit -- continue -- other users or groups, enter your user name in the selected object name (if you do not know the user name you are currently logged on to, click Advanced -- search now, select your username, OK ).
③ Replace the sub-container and object owner. If this is not selected, we only have the ownership of this folder, there is no ownership of his/her subfolders and the files in them (if you just delete a single file, save it), and then apply -- OK. In this way, we have the ownership of this folder, because the previous ownership of this folder belongs to system and does not belong to us.
④ Click "permission"> "edit"> "add", enter your username (or use "advanced"> "Search now" and "OK"), click "User Name"> "edit", and tick the "full control"/"Allowed User Name, OK.
⑤ "Replace existing inherited permissions on all future generations with the permissions that can be inherited from this object. If this is not checked, you only have the permission for the folder outside. The folder in it still cannot be "completely controlled ".
6. Click application-OK-OK.
All right, you can delete the folder if you want to delete it.