You need to boot up in a working environment and get the exact name of the Intel Network Card: Example would be Intel(R) 82575EB Gigabit Network Connection
The correct drivers are here - http://support.lenovo.com/en_US/downloads/detail.page?LegacyDocID=MIGR-73655
Extract those and all the Vista 32-bit drivers will be in this location:
now you have to find the right .inf that matches the correct card. So if your card is named Intel(R) 82575EB Gigabit Network Connection, then that driver match would be located in the e1q6032.inf
put those in a folder and upload into your WinPE and you should be good.
If you need more help, let me know the exact name of your network card and ill try to help more.