You get a message that K9 has been corrupted, or experience abnormal behavior from K9 Web Protection.
If you get a message that K9 is incomplete, or is corrupt, you need to re-download and reinstall the K9 program. Make sure to reboot your machine once the install has completed. You can download the latest version from the K9 download page.
Windows Vista users: Please ensure that you have Service Pack 2 installed. You can download/install Service Pack 2 by using your Windows Update tool. Once updated to Service Pack 2, you should no longer experience the “K9 Corrupt” error message after installing.