media disconnected/ip 169.xxx.xxx.xxx

WHY IS THAT EACH TIME WE TRY TO CHECK IP ADDRESS IT GIVES ME 169.XXX.XXX.XXX
AND NOT ABLE TO CONNECT TO INTERNET.
WIRELESS ROUTER (LINKSYS),COMPAQ NOTEBOOK
ALSO SOME TIMES IT SHOWS MEDIA DISCONECTED.
I TRIED IP /RELEASE , IP /RENEW ..NOGO
IT SAYS CAN NOT PERFORM ANY ACTIONS .
TRIED FLUSHDNS ,POWER DRAIN , NO FIREWALLS ,
SIGNAL STRENGTH IS FINE , BUT NOT ABLE TO BROWSE.