Can't install, Can't uninsteall

I was updating the firewall when my computer suddenly crashed. Now, comodo won’t startup, giving me a error about not being able to load c:\program files\comodo\firewall\cfpres.dll. The file is on my computer. When I try to uninstall, I get another error message telling me the application or DLL C:\program files\comodo\firewall\framework.dll is not a valid Windows image. When I try to install comodo again, hoping that it might write over the old, I get asked whether or not to uninstall the old comodo, which I press yes, and nothing happens.