Bests & Worsts Reviews from Amazon

I hadn't read the other reviews when I downloaded this "recommended" app for my 5th generation Kindle Fire this morning. For starters, you have no idea what it is doing or what it is checking and it takes far less time than any other similar app I have run in the past. That was my first suspicious moment. Then I learned I had 8 viruses when my dedicated AV app finds none? Then to clean I had to pay money? I quickly deleted this app.