Cannot install CIS 3.5.54375.427

I uninstalled Comodo Personal Firewall and Antivirus Suites to install the Internet Security Suite, but every time I run the setup application it will go as far as installing the software for both and then asking me if I would like to scan my system for malware. Then the setup disappears and after a moment reappears with “Rolling back 100%” in the progress window, and a prompt to manually delete the shortcuts because there was a problem removing them automatically. I have not found any traces of either running in the tray or in the background, and upon rebooting I’m prompted with a message concerning cpfconfg.dll not being in the correct location. Any ideas?

[EDIT] Also the program does not appear in my add/remove programs list so I cannot uninstall/repair the installation.