MacBook Pro will no longer access the internet

We have two macs:  A MacBook Pro (2.53 GHz Intel Core Due) and a MacBook (2.4 GHz Intel Core 2 Duo).  Both are running Snow Leopard 10.6.8.
Problem:  the MacBook Pro will no longer connect to the internet.  Network Diagnostics thinks that it is connected.  I can use Network Utilitities to ping a site.  But Apple Mail, iCal, Safari, Firefox, Chrome, Skype, Software Update, etc., cannot access the internet.
The MacBook Pro is set up with a single user account.
Our internet is provided through a mobile phone provider.  If I set up our smart phone to serve as a wireless hotspot, the MacBook, iPod Touch, iPad will all connect.  The MacBook Pro will not.  If I put the SIM card in a USB modem and connect the modem to the MacBook Pro, the modem software will connect to the internet.  If I turn on Internet Sharing on the MacBook Pro, the MacBook, etc., will connect through the MacBook Pro, but the MacBook Pro itself will not.
So to sum up:  the modem software connects to the internet, Internet Sharing works as it should, Network Diagnostics and Network Utilities can't see a problem, and yet none of the apps that NEED to access the internet are able to.
This is the error message that Safari gives:
     Safari can't open the page "...".  The error is "The
     operation couldn't be completed.  Operation not permitted"
     (NSPOSIXErrorDomain:1) Please choose Safari > report Bugs to Apple, note the
     error number, and describe what you did before you saw this message.
This is the error message that Chrome gives:
     Error 10 (net::ERR_ACCESS_DENIED): Unknown Error
I have tried going to System Preferences / Network and deleting Airport and then adding it back.  I've tried disabling the Firewall.  And the same with reboots after each.
We're from the States but currently our work has us in Africa.  To keep from inadvertantly passing on windows viruses to others (viruses are rampant in Africa), I'm running the Intego anti-virus software on both machines (VirusBarrier X6).  I mention this because the problem started after rebooting after an update for that software.  (The MacBook Pro has had the update, the MacBook has not.)  But I also used Time Machine in an attempt to roll back VirusBarrier X6 to its pre-update status.  That didn't solve the problem either, which makes be think that the Intego problem didn't cause the problem.  But I mention it to be thorough.
There is an Apple-certified service centre in country, but it's a long drive away that I'd rather not have to make.  As it would for any of you in this day and age, this is really hampering my work.  Any and all help is much appreciated.

THE FIX
After hours (days actually) troubleshoorting, involving 4 people and Apple Support folks, I'll  save you time. If you have VirusBarrier-follow the Manual to uninstall. use Intego's uninstall and deauthorize Virusbarrier before you trash it. If you have Net Nanny, trash it.
None of the above-it is Foxcomm's Airport/Bluetooth (661-5867) card. Faulty, non existent, blown a transistor, are all comments from Techn Support reps (the Genuis blue shirt reps)
Take it into an Apple Store, have them check the Airport card  (and only the airport card) using " a different operating system". Sorry that is a black hole, as the machine disappeared to the back of the store for"testing. Don't re-install the OS, delete plist files or applications, reconf and spend hours wasting your time.
Virusbarrier, net nanny or a faulty Airport card. In warranty it is covered; out of warranty:70.55 plus $39 to have Apple officially loosen the screws.I have a late 2011 MacBook Pro, can't speak for older models.
Hope this helps the community.

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