hi, i have a sony vaio laptop running on xp. ive been having some problems with my usb ports: -my plug and play mouse will light up and be detected in both my left and right usb ports, but it will only function on the right -my plug and play webcam will work on either the left or right port. -when i tried installing a graphics tablet, the device lit up but the computer failed to recognize it, prompting me repeatedly to plug it in during the install. -all other plug and play devices, such as ipods/flash drives/digital cameras get detected ("Add New Hardware" comes up) and it prompts for driver installation, despite these devices being plug and play. the search for drivers always fails, even if i manually install a driver. under my device manager, the device type will show up with an exclamation point. please help! this is so frustrating bc i cant store anything!