devices installed through unattend

I have a lab which i use to test deployment of vista I use mainly Laptops (IBM and HP) I know how to implement device drivers throught the unattend.xml and WDS but all of my devices that are newlly installed (everything beside CHIPSET devices which WDS fail to load drivers for) are shown with a yellow bang and says something about corrupted drivers.
I use this method in another lab and all the devices (Beside CHIPSET) are installed OK