Hello,
You can try the local install of remote agent on the XP machines with SP2. Here is the technote that describes the procedure. Check the link within the technote which will guide you to the actual technote :
Title: Push installations of Backup Exec and/or the Remote Agent for Windows Servers (RAWS) to Windows XP Service Pack 2 systems or Windows 2003 servers fail with a "connect to server" error.
http://support.veritas.com/docs/270144
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Regards.