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Thanks guys.
I rebooted my router when I couldn't get an internet connection and then it worked again. It happens on a daily basis though, I could be using it for about 3 or 4 hours and then I just lose the connection. I will check Belkin website as suggested.
I will also see what period of time it works for wired.
Dell have confirmed by email that they are sending me a new laptop as they confirmed there was a problem - they checked my computer remotely.. I am very weary they will try to fix it and fob me off with the same one. I'll see what happens....
thanks again.