I have a p200mhz Compaq Armada laptop that has a ps/2 port for a mouse, but ever since I upgraded the ram from 64 to 128, the serial mouse no longer works. If I removed the upgraded 64mb, the mouse works fine again. So now I'm trying out a mitsumi serial mouse (model: ECM-S3101). I'm running winxp on this little puppy but doesn't detect the serial mouse. Is there a special program or driver I need to install? I must admit I never really used computers with serial mouses before 