You cannot log in at this time, login error

[atka]

Hello I have searched on how to fix this problem and I can't find it anywhere so I thought I would ask for help. Ok first some information this is in leopard 10.5.8 and no file vault is not turned on. I know there is file to delete somewhere cause I fixed it once before about six months ago, but now I can't seem to find the file that I have to delete to to be able to login in again.