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are you using dhcp or static ips? if static, make sure one of your room mate's hasn't changed their ip to yours lately, that could be causing the conflict. if you're using dhcp, try running the windows network connection repair thing (available by right clicking on the local area connection icon in the control panel and clicking repair). also, make sure if you're using dhcp that whatever is providing the dhcp service has permission to supply enough ip addresses for every computer on your network. hope this helps (more information about the hardware involved would make the problem easier to troubleshoot)
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