Has anything happened to it recently , like a virus or trojan being removed etc. ? Sometimes when this happens the Winsock or TCP/IP stack can get broken . First of all , connect via a cable and download the latest drivers for the wireless device , if you have a look in Device manager and see who the maker was , then visit the site for the latest drivers , or post back here and someone will do it for you . Then open a command prompt ( best with privileges , start/programs/accessories/command prompt , right and select " run as administrator ) At the prompt type in ( without quote marks ! ) " netsh int ip reset resetlog.txt " and press enter , then , type in " netsh winsock reset catalog " press enter again , reboot the system and retry accessing the internet .