All browsers are not opening

Hi all,
I'm new on this forum so please be patient.
Working with a Toshiba Satellite L650 laptop with Windows 7 Home Premium 64bit.
All of my browsers have suddenly stopped working (IE, Firefox and Chrome).
I click on the icon, the "loading" mouse pointer shows up and then nothing happens.
I've tried restarting my computer, checking for updates and doing a virus scan... nothing is working.
I am now writing from another computer because I'm not able to access any webpage from the one that's having problems.
My Avast antivirus says my computer is clean and I have no way of downloading any other software since browsers are not opening.
Skype is working so I'm guessing the internet connection itself is ok.
Can anyone help please?
Thanks

Welcome to the Seven Forums.

Try a scan with this tool:
What is Windows Defender Offline?
Either burn a CD or use a USB flash drive.

Hi UsernameIssues,
first of all thank you for replying.
I downloaded the offline defender, installed it on a pendrive, booted the laptop with it and it found a "risky" keygen file. I had the defender take care of it even though it was a "safe" keygen. Had the defender do another scan and it said everything was ok.
After that I uninstalled google chrome, installed it again and it's still not opening (same thing happens with firefox and IE).
Can you recommend anything else?
Thanks again.

internet options in the browser?
I am connecting through wi-fi and not LAN.

Please open Task Manager and select the tab named Processes.

Please try and start IE.

Is IE showing in the list of things running?

If you saw IE show for just a second, then something is shutting it down.

Consider starting with step 3 from gregrocker's tut: Troubleshooting Steps for Windows 7

@Layback Bear non of my browsers (IE, FF, Chrome) are working.
@A Guy I am able to use skype and online gaming so internet connection is not the problem.
@UsernameIssues The browsers open up in the task manager and then disappear, I will try to follow those steps and post back.

Dears,

I am also facing the similar problems. Working with a Toshiba Satellite laptop with Windows XP. All of my browsers have suddenly stopped working (IE, Firefox and Chrome).I click on the icon, the "loading" mouse pointer shows up and then nothing happens. I've tried restarting my computer, checking for updates and doing a virus scan... nothing is working.
I am now writing from another computer because I'm not able to access any webpage from the one that's having problems.
My Avast antivirus says my computer is clean and I have no way of downloading any other software since browsers are not opening. Yahoo messenger is working so I'm guessing the internet connection itself is ok.
Can anyone help please?
Thanks