BlockScanner is the new rogue of the Winisoft family (Block Watcher, SoftBarrier, Shield Safeness, Soft Stronghold, Soft Veteran, SoftCop, Soft Soldier, Trust Fighter, Trust Soldier, Safe Fighter, Trust Cop, Secure Warrior, Secure Fighter, Secure Veteran, Security Soldier, Security Fighter, Save Armor, Save Defender, Trust Warrior, Soft Safeness, Safety Keeper, Save Keeper, Quick Heal Cleaner, System Cop, Block Defense, Save Defense, Trust Ninja, Save Soldier, Save Keep, Winishield, Wini Fighter, WiniBlueSoft)
BlockScanner comes from fake online antivirus scanners or fake video codecs. It creates random files on the system and detects them as infected. It also display a lot of disturbing warning messages to scare users, pushing them to buy a license.
If your PC is infected with BlockScanner, use MBAM to remove it.