Hello,
Please ensure that the remote agents on both the machines, remote as well as the media server is running with the LSA. If the issue only occurs on the XP machine, please refer to the following dokument:
http://support.veritas.com/docs/241419
Please keep us updated on the issue.
NOTE : If we do not receive your reply within two business days, this post would be marked assumed answered and would be moved to answered questions pool.