Hello,
Could you please go through the links mentioned below and try the steps mentioned.
1. Error "Unable to connect to Media Server" is displayed after clicking "Configure Desktop and Laptop Option" from the Tools menu.
http://support.veritas.com/docs/273308
2. to perform a push install of the Desktop and Laptop Option agent in Backup Exec 10.0
http://support.veritas.com/docs/270174
Do get back to us if you face any issues with the above mentioned steps.
Thank You,
Shweta