Hello Chris
When the problem first occurred I did try the Universal Packer driver. However your line of thought put me in another direction.
During the boot process, the NIC could not be seen (even though it is enabled in the BIOS). So in the BIOS I enabled the NIC w/PXE, along with using the Universal Packet Driver. Now the NIC is visible and the client can boot into the virtual partition.
Interesting since the GX620 has the same NIC and these BIOS/Network template changes aren't necessary. Perhaps because the NIC in the 745 has a newer firmware version. Anyway thanks for your assistance.
Mike