Activate your McAfee by accessing mcafee.com/activate
If you are suffering from antivirus issue then you should replace your Antivirus by McAfee Antivirus. I am using McAfee antivirus from last many years and it works totally fine. You have to visit www.mcafee.com for downloading McAfee antivirus and then remaining process is McAfee activate. After all process, your computer works fine.