avast! antivirus software represents complete virus protection, offering full desktop security including a resident shield. Daily automatic updates ensure continuous data protection against all types of malware and spyware. avast! antivirus is certified by both ICSA Labs and West Coast Labs Checkmark, and all avast! products are available to download for a free 60-day trial period.  At the end of the trial period, a license key must be purchased to continue using the product, which will be then valid for further 1, 2, or 3 years.