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A m8 of mine bought a laptop from an old friend. the admin password had been long forgotten so I couldn't help him set it up properly as a guest.

After a good while of trying to get in as admin it seemed the only option was to re-install the OS. This was fine because being recently bought second hand there was no information he wanted to keep.

If you got files you want to keep, throw them onto an external HDD and re-install the OS.