What are some alternatives?
When comparing Windows Defender and Kaspersky AntiVirus, you can also consider the following products
Malwarebytes Anti-Malware - Malwarebytes protects you against malware, ransomware, and other advanced online threats that have made antivirus obsolete and ineffective. Free Anti-Malware & Malware .
Avira Antivirus - Download Avira Free Antivirus 2018 and get award-winning PC protection, including next-gen security against ransomware and other threats. Download for free
COMODO Internet Security - Download Free Internet Security Software for Complete protection against viruses and attacks of your computers. Know what's new in Comodo Internet Security.
SUPERAntiSpyware - Superantispyware protects you against malware, ransomware, and spyware. Get started today with free trial and remove Spyware, Rootkits, Spyware, Adware, Worms, Parasite!
ESET NOD32 Antivirus - Best IT security solutions for your home and business devices. Try ESET antivirus and internet security solutions for Windows, Android, Mac or Linux OS.
AVG AntiVirus - AVG AntiVirus has been protecting the computer systems of more than 200 million individuals since it was introduced.