Internet Explorer 8 and Firefox problem

[Endowed]

I picked up a friend's PC on which fails to "connect to Internet. After having configured (Wi-Fi) at home, I found the problem "Internet Explorer can not display this webpage ". I installed Firefox to see if IE was put at issue idem. By cons when I ping sites everything is OK. Ping the Livebox is OK too. Updates to Windows are also without any problems. What can I check

[Techno01]

Follow the steps which are listed below:

1. Uninstall IE8, then back to Internet Explorer 7 it works!
2. Attempt to reinstall Firefox, would not start (no error message)
3. Attempting to install Google Chrome, Firfox Ditto!
4. Attempt to reinstall IE8, still does not start!
5. Back to Internet Explorer 7 which is OK!

[Narmad]

Looking in the various settings, internet connection, I have not seen anything special. In trying to run Windows Update that I realized that IE8 does not start well. Since the last mentioned manipulations, I work with IE7. Well, it works, but I would go back to Firefox. I suppose that installing Firefox 3.5.2 has undertaken the modification of something, but what, and like that was not the end. A bit should bugger, but which one.

[deveritt]

Microsoft. NET Framework Assistant 1.1 is an add-ons. I suspect, not so much this module, the environment. NET be responsible for our problem since neither IE nor FF are about to start. But to disable this module, we need you to succeed to launch Firefox! (There may be other ways to do this, but I do not know). You can access these modules in Firefox: Tools / Add-ons. Have you tested the various "tricks" that allowed me to run Firefox anyway.