can not start firewall

I had a terrible time with avast today and finally after running the start up scan, it came back on, but will not start up firewall. What to do. If I do a clean start up will I loose my paid internet security that I have in addition to the free avast?

Repair avast!:

  1. Control Panel → Add/Remove programs → avast!
  2. Click on ‘Repair’.
  3. Follow instructions.
  4. Reboot.

Do as Asyn said first.
If that doesn’t solve it, we take it from there.

Don’t worry.
Even if a clean install of avast is needed, you will not loose your license.
It will stay valid.
You can always find it here:
http://www.avast.com/resend-license-paid.php