After instaling avast I can't browse the web unless I turn off the web-shield

[Peque]

I was using McAfee before.  I have no idea how to fix it. Please help! Thank you.

[Lisandro]

1. This article provides the steps to remove SecurityCenter from your computer.
http://ts.mcafeehelp.com/faq3.asp?docid=71525

2. If you need, you can find many free versions of these registry cleaners here:
http://www.snapfiles.com/Freeware/system/fwregtools.html

3. Sometimes, McAfee won't be completely removed if, before, you do not uninstall Avast, including the use of its "Uninstall Application" if necessary (www.avast.com/eng/faq-install-uninstall-avast.html).

4. Into the firewall settings, the following programs should be allowed to connect:
C:\Program Files\Alwil Software\Avast4\ashWebSv.exe (avast! Web Scanner)
C:\Program Files\Alwil Software\Avast4\ashMaiSv.exe (avast! e-Mail Scanner Service)
C:\Program Files\Alwil Software\Avast4\Setup\avast.setup (avast! Update executable). This is a temporary file that just appears when an update (check) is about to launch, and disappears again afterwards.

Don't need rights to connect:
C:\Program Files\Alwil Software\Avast4\ashServ.exe (avast! antivirus service)
C:\Program Files\Alwil Software\Avast4\aswUpdSv.exe (avast! Update Service)

[Peque]

I uninstalled McAfee and now it works. Problem solved.  Thank you!

[Lisandro]

I uninstalled McAfee and now it works. Problem solved.  Thank you!

You're welcome. Enjoy avast adventure and fell free to come back any time you need help...