I recently replaced my PS/2 mouse with a USB one, but each time I start up the comp, an error appears at the POST stage saying 'PS2 mouse not found. Press F1 to Resume'. I looked in BIOS and there's no option to disable the PS/2 mouse (and I've checked several times). In Device Manager, there is no PS/2 device listed, I disabled the two Human Interface Devices that didn't have USB beside them, to no luck.
I'm using Windows XP, AMD Athlon 64 processor, American Microsystems MIS MS7191 motherboard.