Contrdictary messages from Firewall

I am running the free Comodo Firewall on a Windows XP SP3 system.

The task bar icon has what looks like an exclamation mark (too small to be certain)

When I click on the icon a message on the resulting page says ‘Defense + not functioning properly! Run Diagnostics.’ Diagnostics does not find any problem with my installation, yet the icon still has not reverted to normal. What should I do now?

Thank you.

Could you uninstall and reinstall CIS by following this method

Thanks! (sorry for the late reply)