How to know System contains Malware?

Today topic is Malware Guys everybody knows about viruses Malware is one of them which may harm our computer system and the user face many problems It includes Pc viruses, worms, trojan horses, ransomeware, scareware. If any computer contains malware then there is a need to take antivirus support because malware encrypts user’s computer data , altering and hijacking all computing functions and monitors user actions without their permission.