Anti-Virus-1 is adware, specifically a "fake antivirus". As with all such adware, it is designed to simulate a scan of the computer, supposedly detecting thousands of strains of (non-existent) malware. The end aim is to sell users a pay version of the fake antivirus in order to eliminate the threats.
When run, this adware warns the user that the computer is not protected. The main screen displayed is a spoof of the Window Security Center
It then pretends to scan the system for malware. If users do not immediately take the bait and buy the pay version of the fake antivirus, the malicious code will sporadically display a message reminding the user that the computer is infected