Amazingly not one single person has mentioned the version of WinPE they are using! Is the original thread referring to the problematic NDIS61 drivers in WinPE 2.1 or some other version? I'd like to help in testing a solution to the problem if it's the same one I've experienced but not one person can contribute with any certainty without details of the real issue here.
It might be just that since it's tagged with sccm2012 that a certain version of WinPE is implied so I apologise if I'm incorrect! For an observer with other products that use WinPE and this network chipset though it would be useful to specify the exact setup for them to assist.