What are the main types of computer viruses that harm hardware and software?

The main types of Computer Viruses that can harm hardware and software include file infectors, which attach themselves to executable files and spread when the program is run, and macro viruses, which target applications like Microsoft Office by embedding malicious code in documents. Boot sector viruses infect the master boot record, affecting the system startup process, while polymorphic viruses change their code to evade detection. Additionally, ransomware encrypts files and demands payment for access, posing significant risks to both data and system functionality.