If the harddisk on that PC has more than just one partition, all you need to do is insert the chinese W2000 CD and install it on another partition. Make sure that partition is empty before you install anything in it. The install will automatically create a start-menu from which (at boottime) you can select which W2000 you want to boot.
You do not need to install two versions of Windows. A simpler solution would be the Windows MUI Pack that lets you install several UI languages into one Windows.