Go to your device manager (if on Windows) and look for Android Composite ADB Interface (under Android Device).
I found the driver for this at http://developer.android.com/sdk/win-usb.html
Right click Android Composite ADB Interface, go to the driver tab, and click update driver. Then select Browse my computer for driver software and point it to the location where you extracted the usb driver package.
After doing this confirm that ADB can see your device by opening a command prompt, navigate your android sdk folder, and then go into a folder called platform-tools. Then run the command "adb.exe devices". If the tango is listed there then your drivers are correctly installed and adb can see the Tango.