That green round port is called PS/2 port. If you plug the mouse in it, you need to restart your comp. Same goes for the keyboard (on the PS/2 port).
I suggest you do this:
Plug in your mouse in the PS/2 port.
Install the drivers from the software disk.
You might be prompted to reboot. If so, do it.
Now you can plug in keyboard and mouse to USB ports. They should be recognized and operational. You might need to reboot your PC after the plug'n'play wizard finishes.
...OR....
Get another USB to PS/2 adapter for the keyboard. Might be better this way, for you'll have extra 2 USB ports.
Don't forget to reboot when prompted.
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Posting Virtuoso
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since May 2006