After you have upgraded to Windows 7, if you are unable to turn on your Windows 7 Firewall, this article will be able to help you.
To resolve this problem, you will have to ensure that the required services are started and running:
- Windows Firewall (MpsSvc)
- CNG Key Isolation (KeyIso)
- Base Filtering Engine (BFE)
- Firewall Client Agent (FwcAgent)
In case they are not, you may get this error message:
Windows firewall can’t change some of your settings Error code 0x8007042c
Once you have downloaded the zip file, extract it contents. Right click on the .bat file and Run it as Admin.
This should help!
Also see Windows Firewall Troubleshooter.