Please also posts more details about your computer. Like which version of Windows is installed. Which version of McAfee's software and whether both products are up-to-date. Did you check Microsoft's Update website? What was the result? Are you logged into Windows as "administrator" or as limited user? This document might be an interestign read: "Hot Tip: Don’t surf as an ‘Administrator’"
What steps did you try to resolve the problem, apart from running the Stinger program? A good program to run is the Anti-Malware from MalwareBytes. Download and run the free version.
Other good program you might want to try is the Microsoft Malicious Removal Tool,
Let us know how it goes...