NO ACCESS

HI EVERYBODY,
PLS HELP ME!I HAVE BEEN TRYING TO LOGIN INTO THE SERVER FROM THE CLIENT MACHINE BUT I JUST CAN’T LOGIN. I GET THE MESSAGE “LOGON FAILURE,UYOU ARE NOT ALLOWED TO LOGIN AND YOU DON’T HAVE SUFFICIENT PERMISSION TO LOGIN.PERMISSION NOT GRANTED ETC ETC”
WE ARE USING WINDOW SERVER 2008.
I GUESS ITS SOMETHING TO DO WITH POLICY.
PLEASE GIVE ME DETAIL STEPS AS HOW TO SOLVE THIS PROBLEM.
THANKS