This is a lifesaver of a product, it has cleaned up and detected so many things over the years that i have donated to the site several times over. This product succeeds where most if not all antivirus fails in detecting why a virus keeps popping up.

I have only used the free version of SpyBot software for personal and SMB use in the past. It's good for what it is: free antivirus and anti-malware software that you can use on your own computer, assuming you're admin

Free. Interface is intuitive. Version 1.62 could be scheduled for auto updates and scans. Immunization feature.