no internet connection

hi all we had a pc in today which would not connect to the web we tried shutting down all firewalls and checking for viruses and it still wont connect we check the drivers and run check disk and we uninstalled web browsers we tried dos commands and internet diagnostic software and it will not connect we checked everything possible so we asked the woman to bring the pc back next week so we can have another go we ran out of time this week with the scans and trying various options we were missing two jedi this week mike and nicky and they will resolve the pc problem next week.