After downloading Norton Security for 2015, Google Chrome, IE, and Mozilla Firefox crashes. When I Googled this, it seems a lot of other users have this problem with no solution. I ran this by my brother who takes his computer in for repair at the The Chip Merchant in San Diego. He was told by them they use Malwarebytes.com ( https://www.malwarebytes.org/). It's free. I downloaded their file and ran it on my computer. Thanks to this program, the problem of my browsers crashing has been resolved. Since I have never ran this program and my computer is 7 years old, the program found over 3900 infected files. These files have been quarantined.