Avast is an antivirus and anti-spyware program that is fitted with a powerful malware detection engine. Four scanning modes are available: quick scan, full system scan, removable media scan, and select folder to scan. These various modes offer a wide range of scanning options, with the first one lasting only a few minutes and the last one being a lengthy, in-depth system scan. Avast is able to operate even when there is already an anti-malware program on your system, which makes it ideal as a form of backup protection. For your convenience, the software gives you the option to set up automatic updates on your computer.
Avast Free Antivirus also contains a tool to create rescue drives on CD or USB, which will help you in case you cannot access your system. Apart from the security functions, Avast Free Antivirus includes utilities to optimize your system and a file cleaner.
Avast offers both a free version, a premium version and an ultimate version. The premium version costs $89.99 and the ultimate costs $119.99 per year.