I use XP Pro, and I've had no problems at all with Bluetooth with either my 7650 or my 6600.
Firstly, make sure you installed your BT software BEFORE PC Suite.
If not, uninstall both, then reinstall BT first. Check it works, then install the 6600 PC Suite. Now turn BT on on ur handset.
You should now have an icon in your system tray that looks like 2 grey triangles. When you hover the cursor over it it should say mRouter. Right click on this and a pop up menu will appear showing "Change Device" and "Properties". Click Properties and a window will appear marked Connection Properties. In this window are a series of check boxes, 2 of which should be your Bluetooth Serial Connections. These will be called "Bluetooth". Put a tick in both boxes. You may get an error message saying....
"Port Enable - It is not possible to enable that port, as it may be in use by another application"
Just click OK to get rid of this message. Depending on your BT software, you may get a request from it asking you to choose or connect your device. Follow the instructions as necessary.
You phone will also ask you if you wish to accept the connection request from your PC, so answer yes.
All being well, you should now see the 2 grey triangles change into a phone and pc icon that changes colour and then turns into 2 green triangles with yellow & blue lines between them.
If you see this, start up PC Suite, and you will be able to use all of it's features.
It is VITALLY important that you have installed your Bluetooth software BEFORE PC Suite.
There were issues some while back with the 7650 version of PC Suite because the mRouterserial.dll file was incorrect. This was sorted by copying over an older version of that file.
This IS NOT a problem with the 6600 version of PC Suite as mRouterserial.dll is no longer a component of PC Suite.
If you have tried all of this and still had no success, then I would suggest it is a setup issue with your bluetooth. Make sure you have the latest drivers for your bluetooth adapter. Your firewall is unlikely to be an issue.
As a last and final resort, speak to Club Nokia.
Hope you have better luck soon,
Rob 😃