1. Security software

  2. Anti-spyware

IObit Malware Fighter 5.6.0.4462

Removes and protects computers from harmful Malware

Publisher: IObit Information Technology  Rating: 7.1 out of 10 (141 votes)

Windows Defender 1593

Anti-spyware that protects against slow performance and pop-ups

Publisher: Microsoft  Rating: 6.9 out of 10 (838 votes)

Malwarebytes Anti-Malware 3.31

This software detects and eradicates unwanted malware programs

Publisher: malwarebytes  Rating: 6.9 out of 10 (190 votes)

SpyBot Search & Destroy 2.4.40

Freeware that finds and eliminates malware, spyware and other unwanted files

Publisher: Safer-networking  Rating: 6.8 out of 10 (1308 votes)

Malwarebytes Anti-Malware PRO 1.75.0.1300

Finds and removes viruses, spyware and other forms of malware

Publisher: Malwarebytes 

ComboFix 15.7.16.1

Superb freeware that scans for and kills malware

Publisher: Bleeping Computer  Rating: 7.5 out of 10 (180 votes)

Trojan Killer 2.1

Detects and kills Trojan viruses on your PC

Publisher:   Rating: 7.7 out of 10 (99 votes)

SuperAntiSpyware 6.0.1200

Malware detector with real-time threat protection and simple interface

Publisher: Superantispyware  Rating: 6.9 out of 10 (77 votes)

ThreatFire 4.5.0

Monitor your computer for suspicious or malicious activity

Publisher: Threatfire  Rating: 6.2 out of 10 (55 votes)

SpyDetect Free 1.0.1

Easily and quickly search your system for signs of viruses and Spyware that could destroy your system

Publisher: Nestersoft Inc  Rating: 3.0 out of 10 (5 votes)