Connecting a mobile to your PC through Bluetooth is a very simple task in Windows Vista. Common tasks like transferring a file to and from your mobile and PC can be performed even without installing the software that came with your mobile or your Bluetooth dongle. Unless your Bluetooth dongle belongs to the stone age, chances are that you won't have to install a driver for it. Windows Vista will do it for you.
1. Insert your USB Bluetooth dongle and you should see a notification message which says that it is installing the driver for the new device. Seconds later you should see the Bluetooth icon in the system notification area.
2. Now turn Bluetooth on in your mobile and make sure it is discoverable. Right click on the Bluetooth icon on the system notification area to bring up the menu.
3. Click on 'Add a Bluetooth Device'. The 'Add Bluetooth Device' Wizard (Figure 1) appears with instructions to turn your other Bluetooth device (in this case your mobile) on and make it discoverable.
4. Check the box 'My device is set up and ready to be found' and click 'Next'. Windows will now search for active Bluetooth devices. If the wizard displays the message "Windows cannot find any Bluetooth devices'. Make sure that your Bluetooth adapter is attached to your computer and is turned on, and that your Bluetooth device is turned on, then check if Bluetooth is turned on in your mobile.
5. When you run the 'Add Bluetooth Device' wizard, it displays a list of the Bluetooth devices it discovered. Select the device you want to connect to by clicking on its name (Figure 2. Your mobile will have a name setup for it in its Bluetooth settings) and click 'Next'.
6. The wizard would ask you to supply a passkey (Figure 3). You have four options while selecting a passkey. You can let the wizard choose a passkey for you, you can use the passkey found in the documentation, you can choose your own passkey or you can choose to use no passkey at all (may not always work). The best way is to let Windows choose a passkey for you, or choose a passkey yourself. Lets say you've decided to choose a passkey yourself and say the passkey is '1234' . Windows will now try to connect with the mobile device using the passkey you supplied.