Just like everyone above has said, anti virus app are the problem. For the most part they slow your phone down and kill your battery quicker constantly scanning everything. I've had Android since the G1 in 2009 and have never had any kind of virus or malware. If you use your head, don't click on links in emails, text messages from people you don't know. Don't visit questionable websites, and don't pirate apps(download from official reputable app stores like Amazon, Google Play, Samsungs App store, and pay the few bucks for the apps you like and use) you will be fine. Do yourself a favor and delete that app from your device, you don't need it.
Also, if you have a task manager on there too, get rid of that. Android has not needed a task manager since 2.2, another problem maker app.