Get InfBlocker PRO Edition Portable Antivirus Free. The software enables you to protect your system from Autorun viruses that enter your system through flash drives. This portable software doesn’t make changes in your system and doesn’t even require installation. When you connect a storage device to your system, Autorun files make it possible for the viruses to infect the system by creating a route from the storage device to your system. The InfBlocker PRO disables the Autorun function and eliminates the risk of viruses entering your system.