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Got a friend local or neighbour with a PC or laptop to pop in and try their machine on your router to see if it gets internet connectivity, then consider testing your PC at their place. That would isolate if the problem is with your PC, your router or both!
Its unlikely but on your PC the software part of the IP stack may have somehow got corrupted. The easiest fix for this is to from Windows - have a techie delete your network device then re-instal it and its drivers. That would reset the software part of the IP stack.
Alternately if its a desktop with a spare PCI card slot then just add another network card - they cost around $45, Install this, let Windows detect it and install the drivers and then simply switch the cable to this and see if the problem goes away. That would fix the problem if its a failing network port with a corrupt IP hardware stack.
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