Router - internet connection ok with ie, but not firefox/msn/avg/skpe?

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i've bought a brand new laptop and a wireless router, loaded with vista. i'm connecting the cable modem to my router, and router to my desktop(by cable) and to my laptop(wireless) basically everything looks fine; all indications show i have proper internet connection. i'm getting perfect connection on my desktop, all programs are fine.

the problem is with my laptop; the ONLY program able to connect to internet is IE7; it works normally, i can receive/send email, surf, download/upload. none of the other programs work. firefox would display a blank page. msn/skype can not register my accounts. AVG antivirus does not update. i have to re-install firefox before i open it, in order for it to work.

i've allowed firefox/msn/skype..etc thru firewall, or even tried turning off firewall. nothing works, please help me!!!

Router - internet connection ok with ie, but not firefox/msn/avg/skpe?microsoft sql server

Are you sure that your Firefox isn't set to use a proxy server that it cannot reach? Check Tools/Options/Advanced/Network and click on the Settings button. If you have a proxy server there, remove it and try to see if it works after removing it...

Edit #1:

Did you disable the firewall on both the wireless router and on the laptop? This is a very curious problem. To me, it seems that there's a misconfiguration, but I cannot narrow it down based on the information provided.

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Router - internet connection ok with ie, but not firefox/msn/avg/skpe?

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