Hello & Welcome to Just Answer,
Sorry to hear of the issue you are having with your device.
To help you with this issue, may I ask:
1) The AGE of the device?
2) Is this the FIRST TIME you have connected power to the device?
3) HOW LONG have you had it connected - to your computer?
4) Have you connected it to the vehicle power adapter - in your vehicle yet?
I only ask because you are NOT "required" to connect it to your computer and "install" anything, as these unit should be pretty much "ready to go" - once connected to the vehicle power adapter and allowed to charge the internal battery for a while (AT LEAST an hour or so).
By the way, let me give you a link to the electronic (PDF) version of FULL manual for this device, just in case you need it.
Click here --> FULL Manual.
Please let me know the answers to the questions above, and if you can connect it to power in your vehicle and power it up there.
Thanks, ***** *****