How reputable is your SP2 download source? It is possible that you downloaded an illegitimate version that is somehow affecting your system.
That aside, are you running the built-in windows firewall? (And if you are, try disabling it to see if that helps)
Do you have a firewire HD / modem? I've seen some mumblings of problems caused in firewire devices by SP2, although the speeds mentioned shouldn't be causing anything like this.
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