So if PC's 1 and 2 are on and running fine, PC 3 comes up and everything slows way down, when you power down PC 1 or 2, the speeds pick right back up?
If so, I'd really check your firmware on your router or see if a friend will let you borrow their router to rule that out. Norton AV and Windows Update (when automatic updates are enabled to the "Download then let me know when to install" option is enabled) like to start gobbling up bandwidth when the PC is first booted. Maybe turn them all on before you go to bed and see if it's still slow in the morning?
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