Avast firewall

I have problem…i ought Avast premium and now its showing that my firewall is off, but when im trying switch on, its saying that is unable to start firewall. iI did check in control panel firewall, there is on. Somebody please help me resolve this problem ore how to get this window dissapeare from avast!

have you tried the repair option from ad/remove programs > avast > uninstall/change

tnx a lot