Lync 2010 connection not possible in my computer

I am unable to connect to Lync 2010 using my own computer. I had restarted my computer a lot of times. But, I can successfully log on to Lync using a different computer, which also shows that the credentials I used were correct.
I get this error when I connect to my own computer:
Cannot Sign in to Lync
The user name, password, or domain appears to be Incorrect. Ensure that you entered them correctly. If the Problem continues; please contact your support team."
With this, I need your help in finding out the cause of this problem.
Thank you so much for the assistance.

