antiav_exe.exe is probably malware or adware. The correct course of action is to remove this file, after backing up your PC, and scanning for more spyware.

antiav_exe has been linked to the malware Trojan.Lodav.A/B Trojan, and should be cleaned right away. Before making any changes to your PC, you should backup your files, or create a Windows system restore point, so you don't lose any important data.

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Since antiav_exe.exe has been found on your PC, you'll probably come across more virus if you do a good search. You can avoid future problems with spyware and adware by using this free PC scanning tool.