Do the following:

• Check that the camera is connected properly. Ensure that the camera’s USB connector is inserted, and that the USB connector is enabled in the BIOS. Refer
  to your computer’s documentation for information on the BIOS.

• Reinstall the video capture drivers and restart your computer.
  

You may have USB devices drawing too much power from your computer. This can happen especially when connecting USB devices to a passive or selfpowered USB hub. In Windows XP, a dialog box appears:

Click to enlarge

Do the following:

• Connect the camera directly to your computer¡'s USB port.

• Use a USB hub with an external power supply.

There are too many devices in the system, causing IRQ problems with the system’s USB controller.

Do the following:

• Remove some devices from the system.

• Restart the system.

• The system will rearrange the resources automatically.

While testing Creative WebCam NX Ultra on motherboards with integrated Universal Serial Bus (USB) ports, we encountered a small number of motherboards that do not meet the USB specification exactly. These and other non-USB-compliant motherboards may not operate correctly with Creative WebCam NX Ultra.
Fortunately, the manufacturers of some of these motherboards have released new versions of motherboards or BIOS to address the problem.
If the setup program warns you that your motherboard’s USB port is incompatible with Creative WebCam NX Ultra, or if the camera does not work on your system and you suspect that the problem may be related to your computer’s USB port, the following is a list of available options:

• Contact your computer vendor. Your computer vendor may be able to upgrade your motherboard or its BIOS to a newer version that addresses USB incompatibilities.

• Use a PCI host adapter that provides USB connectors. If you are not able to upgrade your motherboard or its BIOS, we recommend this approach.

• Attach the Creative WebCam NX Ultra to a USB hub with an external power supply.

• Some USB devices (such as monitors) also operate as USB hubs; you can also buy USB hubs which are to be attached to your computer’s USB port. However,in some cases, attaching a USB hub to a non-USB-compliant USB motherboard connector will not solve the problem.

To look for a USB compatible product, you can visit the product search page at the official USB Web site