Broadcom for A30 Thinkcentre desktop 8199?

Hi--just rebuilt a IBM thinkcentre A30 desktop and it's telling me in the device mamnge that I;m missing the ethenet controller I can't seem to find the proper broadcom driver please help

This is the site I found with the drivers--but nothing on ethernet controller(broadcom netxtreme gigabit ethernet) is what i believe i nedd? Thank you in advance.

http://www-307.ibm.com/pc/support/site.wss/document.do?lndocid=MIGR-51601#ai

Click on the AutoDetect button on the right
http://www-307.ibm.com/pc/support/site.wss/document.do?sitestyle=lenovo&lndocid=HOME-LENOVO#rdt

Or:
Run SIW http://www.gtopala.com
To see what motherboard and onboard ethernet you have

Broadcom drivers
Use the Archive link for other drivers
http://www.broadcom.com/support/ethernet_nic/netxtremeii.php