Sorry,
The above Network Card Driver link is old. Here's the latest, which you probably already know:
http://www-307.ibm.com/pc/support/site.wss/document.do?sitestyle=lenovo&lndocid=MIGR-62922But first, before installing this, install the Lenovo System Interface Driver. Then, when you install the network driver, be sure to say yes when it asks if you want to install the Intel Proset Utility.
Good Luck,
- gurutc