Clearing virtual COM Ports?

I have just purchased a Nokia 6600 and I want to connect it to my computer. I have obtained a Bluetooth Dongle with software and installed that along with PC
Suite following the instructions to the letter. First time around I could not get PC Suite to open properly but I managed to get it connected to the phone and after trying lots of different things uninstalled the lot and re-installed. Now I have bluetooth working, PC Suite working but cannot connect PC Suite to my phone. I keep getting a message that the virtual port I need (COM 4) is being used by another application. I need to clear this virtual port for PC Suite to use and then I think I may be able to connect. Please help as I have no idea how to do this and have been trying for days now.