Making your PC discoverable
The Microsoft stack defaults to keeping your PC invisible. This is the safest way of operating Bluetooth on a PC. However, some applications may require the PC to be in discoverable mode. To change this, go to Control panel and click on Bluetooth devices, then choose the Options tab.
Select the Turn discovery on box and click OK.
Note: Setting your PC to discoverable will not allow you to automatically accept incoming file transfers. To do this you will need to run Receive File from the Bluetooth Icon.