My existing mouse is plugged into a serial port, and it has the "roller type ball". It is a pretty old computer. I don't use it for anything except for 1 program basically. The 0S is windows XP. The program I have is not compatible with Vista, which is what I have on this computer. That's why I've not put it on this one... I'm sure you're right. I could have probably got one from my son before he took all his computer parts and monitors to "recycle heaven"
thanks..
