If you want to connect your Nokia Lumia 900 with your PC Via USB Cable, but your computer is not detecting your device then your have to download and install proper USB driver for your phone. When your connect your phone with your PC you are able to transfer files from your phone to your PC and from your PC to your phone.
In this article you can download proper drivers for your device from the link given at the end of this page. It is totally free to download. You don’t have to pay for anything its totally free from Nokia. It is compatible with all windows versions. So get the latest updated drivers for Nokia Lumia 900 and get more from Lumia 900.
You can start download Nokia lumia 900 USB drivers by clicking on the link given below. Click on the link and wait a second to get your file now. Download Nokia Lumia 900 USB Driver