Hello Saleem,
As I understand:
1 : Backup Exec on Windows XP Machine which has a TAPE Drive
2 : Remote agent on Windows Server 2003 R2
3 : We are not able to see Windows Server from Backup Exec's selection list through Windows Favourate, Domains...etc
-- Create a new selection list, Add the Server under "User Defined Selection" with the IP address.
-- Make sure that port 10000 is open on both the machines
-- Edit the HOSTS file on both the machines and manually add the computer names