Please read the info presented here explaining what the term "MC'97" means:
http://www.via.com.tw/en/products/ch...-series/km400/
Then try visiting the support section for matching drivers:
http://www.via.com.tw/en/support/drivers.jsp
If all that fails to produce any help, try posting the brand and model of your computer/motherboard (this step should have been included with the original post).