The biggest difficulty in the use of free antivirus programs is exactly the lack of help documents. The help files of most free antivirus programs are very superficial, not clearly addressing the various issues that may be encountered during scanning for viruses on their computers.
This forum has been addressing this lack of general information on various aspects of activities about the antivirus. Incidentally, here users find what is missing in most free antivirus programs: a communication channel for learning and implementing the fight against the pests that destroy the proper functioning of any computer.
For those who are adherents of mobility, it is recommended to use ClamWin Portable antivirus. For more information and download, please visit this site: http://portableapps.com/apps/security/clamwin_portable