Are you having an issue? This document from McAfee will assist you in with any virus or malware issues you may be experiencing.
You could also try running the McAfee Stinger scan which is included in the document to get another opinion.
Please remember there is no security software offered by any vendor that I know of that can prevent 100 percent of any virus, malware, or adware from ever infecting anyones computer because hackers are constantly trying to beat the system. It could originate from overseas or it could be your next door neighbor.