Hm, you say you have a cable modem; do you have a simple NIC installed?
http://inetexplorer.mvps.org/answers2.htm#connection_freeze

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Sandi - Microsoft MVP since 1999 (IE/OE)
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> I have a computer with three operating systems installed (XP Pro, 2K Pro,
> and Win98 SE). I have no problems connecting to and surfing the internet
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> I've used different browsers and it continues to happen. Any helpful
> suggestions are welcome.