Pci simple communications controller could not find a driver so there's no internet, board is an Asus p5smxse with 2 chipsets, one on the north and the other on the south. sis 968 and sis 671fx

Enter your bios and make sure you're lan is [Enabled].
Open the link provided below;
http://www.asus.com/product.aspx?P_ID=fLSzpcTDJYT0rgS6&content=download
Choose you're operating system from the drop down menu.
There is one LAN driver, Sis Driver V2.0.1039.1070 for Windows 2000/XP/2003/XP 64bit/2003 64bit. Create a folder on your desktop and name it LAN. Download the LAN driver into the LAN folder. Uncompress the zip file, keep the uncompressed file within the LAN folder. Open windows device manager. Find the pci simple communications controller. Right click on it once. From the pop-up menu left click, update driver. Follow windows instructions. Find the Lan folder on you're desktop and open it. Left click once on the newely created Lan folder so it is high lighted. Click OK. Windows will find the correct software and install it for you. When finished restart you're system. Check windows update for hardware and software updates after windows restarts.
More often than not (pci simple communications controller) points to an audio driver missing but LAN controllers are included.

Cheers!
Mike