Sure, it's free and easy to use, but independent tests show its protection rates regularly dip below 90%, compared to 99.x% for the leading competition.
Commercial packages often although not always deliver the best protection, and sometimes include extras like password managers, web filtering, antiphishing tech and more.
If you're looking for the maximum security, at least consider parting with some cash.
Fortunately, the program bundles everything into its 'Smart Scan'.
Launch this with one click and you'll soon get a report listing any malware it has uncovered, software patches you're missing, potentially risky browser add-ons, weak or duplicate passwords, and more.
The top testing labs give mixed results for Avast Free's antivirus protection, rating it anything from excellent to mid-range.