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Go to Add/Remove programs and remove COMODO Firewall Pro 3. Reboot when prompted to.
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Download the CFP 3 Registry+File Cleaner. Extract the files, and Double click to run the batch file (It is completely Safe), It will remove all left over Comodo Firewall Registry entries & files. When this is done, Reboot.
COMODO Firewall Pro 3 should now be completely gone. You can also refer to the manual method of uninstalling here.
Thanks
Josh