error message: Comodo Security agent could not start

I have installed and uninstalled Comodo Free Firewall three times and am stuck. I get the Error message: Comodo Security agent could not started. Diagnostics find no problems. Service/Process cannot be started manually either. Computer specs: Vista Ultimate 64bit SP2, AMD Athlon II X4 640, Gigabyte M68MT-03, 2 GB single Channel DDR3. all drivers up to date. Bitdefender Free Antivirus. Where to start in diagnosing what could be causing the problem. the XP installation on same machine went flawlessly. EDIT: attached Cis Reports

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