Antivirus programs are not all the same — some do better than others at detecting known and new malware.

In a recent round of testing, G Data Antivirus performed the best:

…an impressive 99.95 percent block rate for traditional, signature-based detection of known malware, a rate better than that of any other app we tested. It was likewise strong at blocking annoying adware, running up a 99.8 percent score, and these strengths helped it earn top billing.

The reviewers found it slightly more complicated to use than other programs, but worth the effort. The second place finisher was Norton Antivirus.