Question: what are the most common types of computer security risks?
Answer: Computer virus. We've all heard about them, and we all have our fears. ... 
Rogue security software. Leveraging the fear of computer viruses, scammers have a found a new way to commit Internet fraud. ... 
Trojan horse. ... 
Adware and spyware. ... 
Computer worm. ... 
DOS and DDOS attack. ... 
Phishing. ... 
Rootkit.