As from the configurations that you posted i do not think that you need VCB
you can still backup (All Local Drives) and restore (Files)
all what you have to do is to choose (Mapped full VM backup) from (Snapshot Client Options)
as mentioned on
(Symantec NetBackup™ for VMware Administrator's Guide: UNIX, Windows, and Linux) Page (52) Table (3-3)
I did not try this before but your configuration fits to this as you are using ESX 4 ,NBU 7.1 and the client is Win2k3
so i recommend that after backup try to restore a single file from your desktop for example to make sure that it works
(Please let me know if it works as i might need to use this feature)