Router problems... again :-(

[Neil_Luv's_BLU]

Hi guys.

Had to replace my previous router with a new one last week. Everything seemed to be going well, I was able to get it online pretty fast and every other aspect of the PSN works just fine... but I have hit a major snag in my online enjoyment... I'm unable to play multiplayer games, primarily MW2, be it a LAN game or with other PSN users, I cannot play matches with anyone (made even more frustrating by my recent acquisition of the stimulus pack) All it does is bring up the message box "connecting to matchmaking server" or "fetching playlists", but it never progresses beyond that point. And when starting a LAN game it just brings up yet another error message

The router I purchased is a Belkin F5D8635UK4A... any help (or replacement router suggestions) welcome and appreciated!