A non-Microsoft firewall is installed on this computer. Windows-certified firewalls are automatically configured to work ...

A non-Microsoft firewall is installed on this computer. Windows-certified firewalls are automatically configured to work with HomeGroup. Firewalls that are not Windows-certified might block or limit HomeGroup communications. Allowing HomeGroup to communicate through the firewall might resolve the problem. You can open the non-Microsoft firewall program from your Start menu.