A well-known adware program is preventing users from installing antivirus products by leveraging a Windows feature that was designed for security. The program, known as Vonteera, abuses the digital signature check performed by the Windows User Access Control (UAC) The program copies 13 digital certificates that were used to sign antivirus programs and security tools to the “Untrusted Certificates” store in Windows. The technique only prevents new product installations or the execution of stand-alone removal tools that need administrator privileges.”]