IMac won't connect to internet anymore

I've had my iMac for over a year now and rarely had any problems connecting to the internet but now I cannot connect at all. I've read people having similar problems and it may be connected to an update but to be honest I'm not very knowledgable when it comes to this kind of thing so would really appreciate some help.
I connect wirelessly to the internet through my home network which uses a BT Home Hub router. Four other computers (all Windows) also connect and there's usually no problems whatsoever. I turned on my Mac today though and I cannot connect to the internet.
I can connect to my home network, although the connection seemingly keeps going down. However, even when I can stay connected to my home network I cannot connect to the internet. I have had brief periods when I have been able to but websites take absolutely ages to load and the internet connection usually goes down shortly after. None of the other computers on my network are affected, so this problem seems to be isolated to my Mac. Sometimes my Mac can't find any other networks so I have tried turning AirPort off and on again and this usually finds me my home network again but sometimes I cannot connect to it straight away, the connection sometimes times out.
My latest attempt to connect to the internet resulted in me turning AirPort off and on again, connecting to my home network but not finding an IP, then it came up with a self-assigned IP, then it lost connection to the network altogether.
Any help would be greatly appreciated and if any more info is needed I will be happy to give it.

I have exactly the same problem. Have a brand new 27" iMac and can't connect to the internet. A MacBook, MacBook pro, and iPhone have all connected with no problem and continue to do so. Won't access the internet, says password is invalid when I know it isn't, if I manage to get connected (4 times out of about 50 attempts), it throws me out after a few minutes. It doesn't remember the connection settings and I have to go through setup every time I try it.
The signal is strong - I have just tested the connection by trying to connect my mobile phone (Nokia) to the wireless. No problem, instant access, first time. Have spent hours on the phone to Apple and their only conclusion is that it is their wireless card and operation system that is causing the problem and the only solution is to get my internet provider to change the settings on my router.
This is the newest Mac. It retails at £1350! Why can an old phone do what the iMac can't? This is so far from acceptable. I am a new Mac user (the others are my girfriend's and her family's) and if it wasn't for the fact that my girlfriend is such an avid mac fan, I would send this back and buy a pc.
Very unimpressed.

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