The free version of Malwarebytes’ Anti-Malware doesn’t offer real-time protection (the $39/year full version does), making it useless as your first line of defense.

Malwarebytes’ Anti-Malware Free is extremely easy to use. Youload it, check for updates at its prompting, then start the scan.To scan just one drive, file, or folder, right-click it and selectScan.