Well in short i messed up with some folder's right click>Proprieties>Security Tab. Those folders are in an external HDD. The outcome of such a thing like (like messing with stuff you don't fully understand) is that now, when the HDD is connected to another PC, those same folders become accessible only after providing the administrator password (a pop up message saying: "you don't currently have permission to access this folder" is shown for the folders and their sub-folders and their respective contents). Is it there a way to restore those folders to their normal state where they can be accessed/watched by anyone with out any permissions whatsoever? (and the files inside them too of course), like any normal windows folder?
Set the owner and permissions to "Everyone". You might have to go into the properties twice: first for ownership, then second for permissions.
You should be back at the