DangerousVirus, which may also be named as Dangerous Virus, is a Rogue Anti-Spyware application which is made only to scare users and push them into buying their product. Message:

“Your system is infected with dangerous virus
Note: Strongly recommend to install antispyware program to clan your system and avoid total crash of your computer"

The road begins, when You open a video link and a pop-up message says You need to install Video ActiveX Codec. A trojan hides Under this codec name, and just after installation, You will be infected with a ZLOB trojan, which shows various fake security messages, which offer to do a system scan with DangerousVirus software. This DangerousVirus only shows exaggerated system scan results to scare the users and force them to buy DangerousVirus.
After the transfer money DangerousVirus will keep silent for some time. Dont even bother giving any money to DangerousVirus and remove as soon as possible.