Viewing Websites Help

Right, I've just seen that now I cannot get onto google or yahoo and a couple of other websites, I just get this lovely error.

http://i34.tinypic.com/im6yj9.png

I can get onto the websites by a proxy, so it must be something wrong my end. All the computers in my house cant get onto google, so I'm guessing its something to do with my router (o2 Wireless Box II)

I've tried resetting it back to factory settings, turning it off, refreshing my dns cache, anything I can think of and I'm stuck. If you can help me, I'll give you VIP and + rep :)

try it on IE, see if you have same problem.

sometimes firefox messes up/.

Tried, every computer in the house doesn't load those sites, so I doubt its firefox's problem

Ring o2 up? You may need a new router :P

Never mind, the problem has righted itself now :S

Case closed.

Most likely maintenance within your area.