If your Steam app keeps saying that it’s blocked or unable to open, you must tweak your antivirus or security software settings to exclude Steam when it’s doing a scan. Most security software have an option to allow a user to restore a file or program that it has deleted automatically. This can lead to a security software blocking or deleting some files or applications needed by your computer to load Steam application.
Some antivirus programs may incorrectly detect the Steam client as a malware.
