Network currently connected how ever one pc not connected to the internet

i have the wrt54gl and i got 2 pc's wired and ps3 connected wireless. my dell deminsion e520 was working fine yesterday however today I am unable to connect to the internet today. I reseted everything change the ports and still nothing for e520. But i am still able to share files thru-out the network even my ps3 could see my computer also. any suggestion?

As you have mentioned in the post, only you 1 PC is not able to go online through the router, an you all other computers are able to go online? If you have any Firewall or Antivirus installed on your computer, try disabling it,and then check if you are able to go online from your Dell PC. If still you are not able to go online then you may try Click on Start - RUN - CMD - "ping yahoo.com" and check if you are getting any replies, If yes then i feel it might be the problem with your Internet Explore.
Click on Start - Control Pannel - Internet Options - then click on the "Connections" tab and below click on"LAN Settings" and uncheck all the checkboxes and click on Ok.
Now open your IE and  check if you are able to browse internet on your computer. 

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