Problems Connecting to Wifi

Hi guys,

Just got my 2011 15" MBP a few days ago and i've been loading it and trying to configure but i can't connect to the wireless network. In fact most of the wifi networks come and go at times and mine is never on the list. When i manually entered it in, all i got was a "connection timed out" message.

I've got a Belkin Play ADSL2+ router modem with updated firmware. I've tried broadcasting in G,N,B and even mixed mode using a WPA security at the moment. I have 2 other systems connected on it. XP and Windows 7. Not to mention my iphone. I've scoured the web looking for a solution but none so far.

I've rebooted the modem several times, removed the manually entered network from the preferred networks list.

Does anyone have suggestions that could help?