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The common element appears to be the NIC or system configuration if the other computer doesn't exhibit any symptoms. Have you checked in Device Manager under the properties of the NIC? I'd try setting the speeds to 10mbit or 100mbit instead of auto, see if that has any effect.
You might also try resetting the TCP/IP stack using this command, this only works for XP.
For these commands, Start, Run, CMD to open a command prompt.
Reset TCP/IP stack to installation defaults. netsh int ip reset [log_file_name]
Note: the log_file_name needs to be specified, e.g. netsh int ip reset reset.log
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