Computers Won't Buffer Video/Music

For whatever reason nothing will buffer here at home (youtube, myspace, etc) after a few seconds. It'll start out working fine and then just stop buffering.

We have a wireless network here so we can share a printer. I've tried all the computers in the house (Vista, XP), multiple browsers (Firefox, Explorer, Chrome), disabling the firewall, and clearing browser data. Nothing has helped. Any help would be greatly appreciated!
 
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