Malware, short for malicious software, is software designed to infiltrate or damage a computer system without the owner's informed consent. The expression is a general term used by computer professionals to mean a variety of forms of hostile, intrusive, or annoying software or program code.^[1] The term "computer virus" is sometimes used as a catch-all phrase to include all types of malware, including true viruses.... Read more: en.wikipedia.org/wiki/Malware

Malware removal resources:
bleepingcomputer.com
Malwarebytes Malware Removal
Hijackthis