You didn't go into detail, but I will tell you what you have and what you need by the information you gave me, tell me if I'm wrong.
You have an ECS-K7VZA3 motherboard with a Via KT133(A?) chipset.
You need to install the Via 4in1 Dirvers, version 4.38. Nothing higher, nothing lower, use 4.38. Unless of course you are running Winblows 95/98/98SE, then use 4.35.
Here is a link, scroll down to half page for correct drivers.
<A HREF="http://www.viaarena.com/?PageID=2" target="_new">http://www.viaarena.com/?PageID=2</A>
I will 99 percent garentee this will fix your problem. I had the same one with A-Bit KT7e with KT133E chipset, I found this tidbit of information out about using the older drivers only.
What are we going to do tonight Brain?
The same thing we do every night Pinky; <b>Try to take over the world!</b>