I've used quite a few different antivirus software, but since they cost money, and have an entire year subscription, I can't change it as often as other software. I used to use Kaspersky which was pretty good, but it bogged down my PC so much, I eventually switched to Avast. Avast was great, so I decided to go Pro, and guess what? They have ads in the Pro version, I only lasted a couple of months, and killed my year contract due to ads being that annoying. I'm currently on Nod32 with Malwarebytes which seems to be working out well for me, but sometimes its so silent, I forget its there