This should fix it. If not I included some articles with trouble shooting that helped a lot of people fix their sp3 no usb support. It happens to many people, you are not the first. Also is the camera turned on to usb mode? I figure it is, just asking. GL hope you get it figured out.
Remove and reinstall all USB controllers
To remove and reinstall all USB controllers, follow these steps:
Click Start, click Run, type sysdm.cpl in the Open box, and then click OK.
Click the Hardware tab.
Click the Device Manager button.
Expand Universal Serial Bus controllers.
Right-click every device under the Universal Serial Bus controllers node, and then click Uninstall to remove them one at a time.
Restart the computer, and then reinstall the USB controllers.
Plug in the removable USB storage device, and then test to make sure that the issue is resolved.
see if any of these help
http://www.uwe-sieber.de/usbtrouble_e.html http://support.microsoft.com/kb/817900 http://support.microsoft.com/kb/314464