>Trick question -- heh? How about a little more
>detail as in serial port, bus type, etc? Two
>ideas, try another mouse to make sure it is
>working ok (good mouse). Check IRQs for
>conflicts. Also, try to insure the mouse driver
>is physically loaded.

I tried with another mouse that I know it's working ok and even with that the driver (MOUSE.COM in Dos) don't want to load. I checked the IRQs and there are all to default. The motherboard is a Plug and Play. I usually disable this option. Is it possible this is causing this kind of conflict?