that happened once to me and I right clicked the network connections icon and had to enable the LAN. if you don't have an icon you can get to it from programs and click the network conn. and try troubleshoot option if enable doesn't work..
(esconder) Mantenha a sua Caixa de Mensagens limpa, Arquivando mensagens importantes e usando regularmente a opção "Apagar TODAS as Mensagens". (pauloaguia) (mostrar todas as dicas)