Hey,
I play Counter Strike Source 2011 and Team Fortress 2 on lan. I have Widows 7 professional 32 bit and "mobile intel 4 series express chipset family" graphics device which is not listed in the given link. I have already installed the latest version of graphics driver. Whenever i play gamed online, my game automatically starts disconnecting within 10 minutes. As a solution, usually i just remove my lan wire and again insert it in the port. This process takes just 5 seconds, So game automatically get connected. But this time goes decreasing every time and within 20 mins, i have to do this process every 20 secs.