Confict with PrivateFirewall and Avast! 5 Free Antivirus.

Avast Free Antivirus / Premium Security
1

Avast 5 cause freezing Windows.
I installed Avast 5 Free Antivirus. I needed firewall so I chose PrivateFirewall. After restart I can’t ran programs. Windows not responded, was busy and freeze. What’s wrong.

With Avast 4.8 is it the same.