I have a laptop with 4 usb ports. When i plug my camera into 3 of them it locks up the computer (i have to press the power button for 8 seconds to power it down, nothing works) the 4th one wont lock up but it will not show the camera as a drive so i cant access it. checked in system information and there are no conflicts. Uninstalled the usb drivers and had windows find them on reboot and still same problem. I am able to hook the camera up to another laptop with no problems. The problem also happens when i hook up a card reader to the ports.I am running windows xp.