I installed comodo internet security (3.5) without the option antivirus (I already have eset as antivirus).
When install finished, comodo asked to scan for malaware and defense+ is enabled with Clean PC mode.
“The Defense+ component of Comodo Internet Security Pro (hereafter known simply as Defense+) is a host intrusion prevention system that constantly monitors the activities of all executable files on your PC. With Defense+ activated, the user is warned EVERY time an unknown application executable (.exe, .dll, .sys, .bat etc) attempts to run. The only executables that are allowed to run are the ones you give permission to.”
That scan was post installation scan to ensure your computer is clean before setting Defense+ in Clean PC mode. The installation scanner was there even in CFP 3.0.x.x versions. So there is nothing to worry about, CIS anti-virus is not installed