Normally, I'd say check/disable USB, IRQ and stuff but it sounds like you did that. I dunno that particular brand laptop, and it sounds more like a network problem but check your SATA (if it's SATA) and if it has an IDE compat mode or disable RAID compat mode or whatever other fancy shenanigans it might have.
Also, remove the Ghost virtual boot partition from the equation. Boot off floppy, CDROM, USB stick, or PXE. Make a connection just to the Ghostcast Server. Run the GS on your server w/out the console. It'll all be manual, but it'll be a start, just to get tha out of the way.
Do you have more than one NIC in the laptop? I've had annoying problems before, when I've had two or more NICs in a client. It would boot and load up the driver for one NIC but try to use the other NIC to make the Ghost transfer and do that inside-ghost initalize packet driver thing (unrelated to the MSDOS bootup and loading of the NIC driver.)
I seriously doubt it's a client AVlfirewall thing or anything, as once you've booted into the virtual partition (or floppy, CD, PXE, USB) there isn't any AV/firewall involved on the client-side.
Good luck,
PH