Machine not getting through WinPE4.0 x86

Hello,

I'm trying to migrate from win xp to win7, when booting Lenovo 9645 to winpe4.0 x86 it says:

Validating the network connection <validation criteria = -169.254>...

Restarting DHCP client service: retry 1....

I understand that this is because relevant network drivers are not being found due to which machine is unable to communicate with the DHCP for IP registration.

I added the preboot drivers to the Altiris DB, and I see it's present in the folder. I rebuilt the PE envierment and updated it on the client.

but when I reboot to PE it's not working. when I do ipconfig I see that there is no network card detected.

I tried loading the driver manualy in the PE with drvload.exe and it works fine, gets the ip and so on.

Please help.

Thank you.