ExtraAntivir is a fake anti-spyware application which enters the system with the help of trojan. Trojan comes to the machine via its vulnerabilities and makes a perfect background for the parasite to sneak. After the infection takes root on your PC you can except to be bombarded by faked scan and many bogus alerts about system vulnerability and infections.
Do not fall for this blatant scam because none of information is reliable. This is a fraud. Malware gains to pilfer money from unwary users. It offers you to purchase “licensed” version of the program. Ignore it and all fake warning messages because they are malicious and fraudulent. Use decent anti-apyware application and get rid of the parasite immediately.