Sometimes hackers find innocent web sites and find a way to hack it and add malware. Below is an example. A (fake) message comes up telling you your PC is infected:
Warning!!! Your computer contains various signs of viruses and malware programs presence. Your system requires immediate anti viruses check! System Security will perform a quick and free scanning of your PC for viruses and malicious programs.
Notice that the message is full of grammatical mistakes, scammers generally aren’t very good at English.
If you see a message like this click Cancel and close the window.