|Operating system||Microsoft Windows|
Free edition: Shareware; personal use only
SpyHunter is an anti-spyware computer program for the Microsoft Windows (Windows XP and later) operating system. It is designed to remove malware, such as trojan horses, computer worms, rootkits, and other malicious software.
SpyHunter is currently at version 4, and receives daily definition updates. SpyHunter has a free version, which allows the user to scan their computer. Purchase is required to remove found malware.
In the paid version, the user is able to receive support from a built-in HelpDesk.
- PC Magazine gave SpyHunter a 2 out of 5 star rating in March 2004, saying it was good at spyware detection, but complained about the performance and usability.
- PC Magazine gave SpyHunter a "GOOD" rating, 3 out of 5 stars, in March 2016. The reviewer concluded, "Enigma SpyHunter 4 does what it promises, eliminating active malware and killing malware that launches at startup. But competitors deliver much more."
In February 2016, Enigma Software filed a lawsuit against Bleeping Computer, a computer support website. It alleged that the latter engaged in a smear campaign with the purpose of driving potential customers away from SpyHunter to affiliate competing products. In turn, Bleeping Computer filed a lawsuit against Enigma Software also for an alleged smear campaign. In March 2017, Enigma Software announced in a press release that a settlement had been reached in the lawsuit against Bleeping Computer, and that both cases would be dismissed.
In October 2016, Enigma Software filed a lawsuit against popular security software vendor, Malwarebytes. The lawsuit arose after Malwarebytes' software began targeting SpyHunter as a potentially unwanted program. On November 7, 2017, Enigma's case was dismissed by the US District Court. 
- Neil J. Rubenking (March 24, 2016). "Enigma SpyHunter 4". pcmag.com.
- PC Mag, p. 92,93, at Google Books
- Jonathan Keane (February 8, 2016). "Enigma Software sues BleepingComputer for alleged 'smear campaign'". digitaltrends.com.
- Cyrus Farivar (August 11, 2016). "Bleeping Computer countersues maker of SpyHunter". arstechnica.com.
- "Enigma Software Group Resolves Bleeping Computer Litigation". enigmasoftware.com. March 2, 2017.
- Kayla Thrailkill (October 10, 2016). "Enigma Sues Malwarebytes After PUP Accusations". techtalk.pcpitstop.com.
- Iain Thomson (November 7, 2017). "Judge bins sueball lobbed at Malwarebytes by rival antivirus maker for torpedoing its tool". www.theregister.co.uk.