You didn't answer any of the questions.
make sure key.dat and the whole blockland folder is not read-only
Every time I set the whole folder to read-only and apply and close the properties window, it gets set back to read-only.Peculiar.
"Every time I set it to read-only it gets set to read-only"Did you mean "Every time I set it to not-read-only it gets set to read-only?"