I tried that already with Internet Explorer, indeed there is an option called Content Advisor which blocks and password protects any website which is not in the white list. Unfortunatley, it displays an alert. As for Comodo, I used that before, and eventually it crashes, and needs re-installation, over and over again. You know, there is not such a big problem that NoSetup wasn't able to block AVG and Avira or Norman. I think nobody is bothered if someone else tries to instal an antivirus on his or her computer. The problem was if they uncounsciously installed a malicious program which used the same type of installer. Since you say you solved it, then I think we shouldn't worry much. Anyway, the other program I used - the trial version of Faronics, boasted they could block all types of installers, including .exe, .ocx, .ax, .sys, .drv, .x32, .vrd, .scr, .tlb files. I was wondering if NoSetup can do the same.