Avast support Antivirus is an efficient and comprehensive antivirus program. It is one of the most popular antivirus programs available. Avast Free Antivirus comes with a range of standard scanning options, based on depth and speed. Rapid scan will suffice in most cases - targeting removable media and the files you select, identifying security threats in usually less than a minute. A startup scan will launch automatically on boot up and is a useful, regular security check. The optimized scan engine in the latest version means scanning of text content is significantly faster than previous versions. Improved memory usage means Avast Antivirus should cause less strain on your system so you can continue with other tasks faster.