I need help to help.

[cadremis]

There's one guy from Spain in the Spanish Avast International Zone and he claims that he's trying to use Avast 5 AIS and he can't start the firewall.... He has windows 7...

http://forum.avast.com/index.php?topic=60909.0

What details can I ask him to provide in order to help him?

Advise..rm

[Lisandro]

I suggest an installation from scratch:

1. Download the latest version of avast! Uninstall Utility and save it.
2. Download the latest avast! version and save it.
3. Uninstall avast from Control Panel (if possible). If, for any reason, you can't run it, try booting in Safe Mode and doing it from there. Anyway, boot after that.
4. Run the avast! Uninstall Utility saved on 1. If, for any reason, you can't run it, try booting in Safe Mode and doing it from there. Anyway, boot after you've run it.
5. Install avast! using the setup saved on 2. Boot.
6. Register your free copy or add the license key for Pro.
7. Check and post the results.