[CapN'C*cksucker]

I know I've read a fix here for this problem before, but I can't rememer it. I've just recently started having this problem. If I host from my wifes pc, players that join are punted, including me, and if a friend joins any server from my wifes pc, they're punted. Any ideas? I think I read once to delete the contents of the cache folder? Any input would be greatly appreciated.