System reboots when USB device connected

I have a new motherboard (MS-7104), and sometimes when a USB device is plugged into the USB ports whilst the computer is turned on, the computer will restart.  This happens around 50% of the time, and there is no pattern to the device or port that is used.
The USB ports worked fine on my old MSI motherboard, so it would appear to be something related either to the new motherboard or to the drivers.
I have the latest motherboard drivers and Windows updates, so I don't know what else to try, or why this problem is occuring. The USB jumpers are connected correctly onto the motherboard.
Board - MS-7104 (P4M800)
CPU - Celeron D 2.26 GHz
512 MB RAM
Windows XP Home with SP2

Power Supply is the silver box that you plug your AC power main cord to your chassis, and it has many cables coming out to plug to your motherboard to provide power. That's the power supply. It does not have any software interface for you to access to know what it is. You need to physically take a look at the power supply itself, and tell what each voltage rail's current rating is - +12V, +5V, +3.3V, -12V, 5V-stby.

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