Bless you, Sevenforums!
I was running into yet another of Windows 7's endless wonderful beautiful
advantages and features: A large backup folder (apparently created by the system during a sudden power-outage shutdown) couldn't be deleted by any of the tricks I know. "You require permission from SYSTEM...."
Well, on a sane OS you wouldn't require permission from anyone to delete a folder on YOUR OWN FUCKING COMPUTER WHICH HAS EXACTLY ZERO OTHER FUCKING USERS.
Finally found the answer
here on SevenForums.The trick is fairly simple: a registry entry that gives you the ABILITY TO DELETE FUCKING FILES WHEN YOU WANT TO DELETE THEM.
Again, bless you.
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Imagine the automotive equivalent: The user's manual doesn't tell you how to change a tire that was punctured by nails. It only tells you how to change a tire that was punctured by glass. If you run over a nail and get a flat tire, the tire is completely unremovable. Every time you put the lug wrench on a lug, a loud alarm sounds. You call the factory from a pay phone, run through a hundred layers of unhelpful assistants, finally get the right administrator on the phone. He tells you how to punch in a mysterious code, usable only once, which will make your on-board computer release the tire lugs.