Hi,
Looks like WInPE does not have the network driver for this system. Could you try adding the driver from Ghost Boot Wizard?
If you select WInPE and select Edit, and then chose the WinPE you use and again select Edit, you will be able to add drivers to it.
Even before trying to add the driver, you can manually load the driver to WinPE and see if it is going to work. To do that, once it boot to WinPE make the driver available from a USB/CD media and use the drvload command to load it. Syntax is
drvload <path>\<inf file name>
for example, it is like 'drvload d:\drivers\vendor\network.inf
Krish