If you are connected via Cable, you need to unplug it from your cable BOX and then wait for exactly 2 - 5 minutes to wait for cooling of connection and/or box. Then plug it up again and wait for 10-15 seconds for connection to reach, connect, then validate.
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To make sure you don't have a virus or something, run HiJackThis and then run a Spybot Search and Destroy scan and perhaps run Ewido and perhaps Ad-Aware SE to make sure that a Trojan or Adware isn't causing this dilemna towards you getting no Internet connection after a certain time.
Make sure you don't have a Firewall blocking a program that gives you Internet (e.g. college programs for security)
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