Online programs won`t run

hi, I`m using my hp pavilion dv7 with vista home 64bit, and all my programs or games that requires internet connection won`t work, except the vista updater and my browser. my firewall is turned off, and i`m the administrator on the pc. for example: i tried to run Perfect World, but the updater says i have no internet connection, the Google Chrome downloader says the same, and any other program or game too. please help.
thanks, Peter