Cannot See Network Printer

Hi, I have been running a network Printer (HP Laser Jet 3055) on my home network (BT Homehub 2.0) for some months. I am running Windows Vista with SP1 instsalled.

However, I have just changed my Antivirus softwere to BitDefender Internet 2009 and now I cannot see the printer on the network so I cannot connect wirelessly. Also the BT Hub does not appear on the list of Network Devices.

I have looked in the BitDefender Knowledge Base but I cannot find anyone experiencing the same problem.

Can anyone help me please.