A friend has a file labelled AVI_0070 of about 3GB in My Documents. When she tries to delete, open or do anything with it, error message 'Windows Explorer has encountered a problem and needs to close'. Then My Documents closes.
I talked her through booting into Safe Mode but My Documents was missing. Her young grandson has added himself as an Administrator. When she logs on as him in Safe Mode, My Documents is missing there also. She is reluctant to delete him as a User as he has a lot of pictures stored.