Toshiba e350

Have installed tomtom on toshiba e350. \having problems when connecting in the car. Error message reads Unidentified USB Device.
Enter the name of the device. For information, see the device manufacturer's documentation. When I goto the the gps COM 1 is missing. Can anyone please help me out on this, have searched the tomtom site with no joy.

Thanks

Jab,
What GPS receiver are you using? Is it the Tomtom one? On the tomtom screen - bottom left (File Menu), you can go into GPS status, and in there you can select what GPS receiver it is trying to get a fix from. Make sure this is correct, depending on what receiver u have, and that the computer to satellite connection is moving (a wee black line running between the PC and Satellite icons!) If this isn't moving then download the updates from the Tomtom website.
Let me know what this says and i'll try and help you.