Could you please post the exact error message you are getting, and tell us when are you getting that error ?
Also, what are the server and client operating systems ?
Are you able to “see” the domain controller from the client machine ? can you ping it ?
Rule #1: Lose the caps.
Rule #2: Request, dont demand.
Rule #3: Express yourself clearly regarding what you need help with. Explain what you have tried so far, and explain the results you have obtained.