Your original post asked if there was "ANY way" of connecting your 770 to the internet via a Bluetooth connection to your Windows computer. Now it turns out that you don't mean ANY way, and it is not clear what you do in fact want.

Maybe it's time to look at the basics of what is meant by "Dial-up Networking" (or "DUN") and "Bluetooth DUN".

DUN is a way of connecting computers through telephone lines. Unlike DSL (which is connected all the time), a dial-up connection has to be dialled up, just as you have to dial up a connection between phones when you make a voice call. Each of the connected computers needs a dial-up modem to interface with its phone line.

Your Nokia N8 contains a modem that interfaces with your mobile phone line, and your mobile provider operates an ISP as well as a phone service. When your N8's modem dials *99#, your mobile provider's exchange connects your line to the internet gateway that the same provider operates. Most mobile providers in the world use that code *99# for connecting to their own internet gateways. However, other than when you use your mobile provider as an ISP, the *99# code has no particular significance in Dial-up Networking.

Bluetooth DUN is a service that wirelessly connects a computer to a dial-up modem. The modem must be contained in or connected to a device with which the computer is paired for BT. For example, you have paired your 770 and your N8 so that your 770 can connect with the N8's modem and instruct it to dial *99#.

If you open the Bluetooth Configuration of your Windows computer, you will find tabs called "Local Services" and "Client Applications". Each of those two tabs lists a service called "Dial-up Networking".

The "Client Applications" DUN enables your Windows computer to access the internet via a paired BT device containing a dial-up modem (for example, your Nokia N8).

The "Local Services" DUN enables a paired device (such as the Nokia 770) to access the internet through a dial-up modem contained in (or connected to) your Windows computer.

Now, which of those services do you want to use, and what phone line do you plan to use for the connection?