Firewall can't be turned on.

I got an error which comodo says it can’t fix, and it’s installed on a refreshed windows 8.1 64 bit.

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Please try reinstalling CIS following Most Effective Way to Reinstall CIS to Avoid/Fix Problems by my colleague Chiron. It will provide a reliable clean starting point.

Let us know if the problem persists. If it does we may be looking at a bug.