Some XP users have reported that if a GPS is plugged in to a serial port
whilst XP is booting, the mouse pointer jumps all over the screen. If this is the case you may
have to do the following:
Unplug your GPS from the system
Disabling serial mouse devices by doing the following:
Right click My Computer
Select Properties
Select Advanced Tab
Select Settings in Startup and Recovery
Select Edit
add /NoSerialMouse (this is case sensitive so add it exactly as
shown here) to the line that looks like:
multi(0)disk(0)rdisk(0)partition(2)\XP="Windows XP" /fastdetect
so that it now reads:
multi(0)disk(0)rdisk(0)partition(2)\XP="Windows XP" /fastdetect/NoSerialMouse