Avast Free Antivirus
A newer version of Avast Free Antivirus is available.Or, Learn More About Avast Free Antivirus
Full user review
"Avast was a disaster for me."
None that I can find. Viruses would probably cause less damage.
I did a full system scan on my 2009 iMac and several external hard drives. It ran for 32 hours and terminated with an error message and it crashed my Time Machine backup drive. Also, it gave me no way to delete the infected files it found. Like I said: a disaster.