The Network Firewall Isn't Functioning Properly...

The Firewall was working great until I tried to update, it didn’t work so I had to reinstall previous version which is version 3.xx but now I have a red X on the bottom of the Comodo screen that says… “The Network Firewall Isn’t Functioning Properly”
Any Ideas?

Thanks in Advanced!

Do you have another AV?

And what OS are you using (Vista, XP, etc)?

Under Miscellaneous, press Diagnostics.