Internet Access Problems?

I have a D-Link router and three computers connected wirelessly. My main computer, the one in which D-Link router is set up completely on has now stopped being able to access the internet through it. The other two have no problem getting online and I can't find a solution to the problem. The main computer... show more I have a D-Link router and three computers connected wirelessly. My main computer, the one in which D-Link router is set up completely on has now stopped being able to access the internet through it. The other two have no problem getting online and I can't find a solution to the problem. The main computer has no difficulty getting online when I use a seperate, old modem, so why has it suddenly stopped working via the router?
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