WiFi Problems?

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Heyy haven't been on here for a while, thought you guys might be able to help me =\.

Yesterday we got a BT HomeHub to replace our old BT one that we got in 2004 which is now rather useless and obselete.

Installation was fine and everything but I think there's a connection issue with my PC? The Internet works perfectly fine on my sisters laptop, brothers PS3, my iPhone etc, but for some reason my computer just doesnt like it =|. There was nothing wrong yesterday when the old router was being used and my PC is pretty new.

Pages dont load, or if they do it takes about 5 minutes and alot of the time most images dont show. Not sure how to explain it but if anyone understands, any clue to as what it could be?

I even tried reinstalling the OS (partly becuase I needed to anyway) and still got the same problem.

I'm guessing it isn't the hub. everything is connected via wifi and everything else works great. got any ideas?

[omgDAN!]

Are you connecting wirelessly or wired?