Don't spend any money on antivirus. Just get the free version of Avira Antivirus. It's one of the best rated antivirus out there. Am personally using it on my Dell Laptop with Windows 8.1. It's been 1 year and never faced any problems whatsoever
People need antimalware more and more (in addition to the main antivirus) Nasty installations of things like crossbrowser adware are not flagged by antiviruses. Malwarebytes and Adwcleaner focus specifically on adware / malware. Both tools are free.
Bit defender or Kaspersky is best choice. My view is don't buy any software simply use 360 total security with bitdefender engine very simple and light and also free
download and install Bitdefender safepay for banking transaction its also free