My laptop was infected with Zlob Trojan horse. A unknown popup windows (displaying web page for System Doctor) appear whenever the browser is launched. It is because I have executed a file from the underground.
I installed Windows Defender to remove it. After the deletion by Windows Defender, there are still some residue files in "C:\Program Files\Video ActiveX Object". Those files can be deleted manually.
I noticed there is an entry in the "Add or Remove Programs" for Video ActiveX Object. I am quite suspicious about that entry. Will it perform uninstallation as promised ? Will it reinstall the Trojan Horse. I chose to delete the files in "C:\Program Files\Video ActiveX Object" manually and remove the entry in "Add or Remove Programs" manually.