persfw.exe is Kerio's personal firewall. More information can be found here.

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Tiny Firewall 6 is the greatest security solution for the windows based host presented to general public to date. The suite of features covers the protection from various angles - from network security, file and registry protection, application launch control and management through signature based Intrusion detection and Prevention.

Most importantly - these security features are packed into user friendly tools - such as Track'n Reverse tool which allows to erase changes made to the computer by the applications. Whenever you are unsure about the application behavior - just put it into the Track'n Reverse mode knowing that all your files and registry will be protected and the changes including the deletions could be brought back.