WinCVS is a CVS client, isn't it?
Eclipse comes with its own CVS client, so there isn't any need to integrate anything. All you need to do is configure the CVS repository location in Eclipse.
You should find more about CVS integration in the online help of Eclipse.
The soul is dyed the color of its thoughts. Think only on those things that are in line with your principles and can bear the light of day. The content of your character is your choice. Day by day, what you do is who you become. Your integrity is your destiny - it is the light that guides your way. - Heraclitus