Welcome to the Windows 7 Forum! Glad to have you here!
I don't know how familiar you are with installing drivers and such. Don't ever expect the operating system to handle complete driver downloads or updates.
You have a 5 year old motherboard so Foxconn (WinFast) may not have updated drivers for it on their website.
I found a K8S755M-6LRS or a -6LERS motherboard. It uses the SiS 755/760 Northbridge Chipset and SiS 964 Southbridge chipset.
Also check the SiS website for the chipset drivers.
The latest drivers found were from 2005. You may have to go to AMD's website also to get the latest drivers.