Make sure you have your Windows Firewall and another other firewall turned off and maybe try disabling any other security programs you have running.
Also, if you are running P2P or Torrent programs, kill those. They can eat up all of your bandwidth and definitely cause issues like this. Also, if your router is wireless, you may want to see if anyone else is connected to it. I just got done helping someone tighten down their router wireless security a bit and it stopped a very similar problem that they were having. Apparently, someone else was piggy-backing their router and probably running P2P and eating up all of their bandwidth.
Other than that, the only thing I can think of is that it might still be a dual core issue or a port issue.
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