Simple Firewall needed

The firewall won’t be used for commercial or public purpose so it doesn’t have to have a help files, as long as it has simple intuitive interface. Basic requirements I need passive firewall so it doesn’t have to check if other’s applications activity it will be used only for blocking purposes. Key requirements: - No uninstall option – only installation possible(so it also have to protect its own files against deleting) - Must be protected against termination form task manager or other software, - The applications that have to have blocked or IP addresses may be added only, no removal options, so it will be one way only. The firewall is designed for blocking. Extended version - Optional if someone is able to this. It would be nice if I could applications like Direct Connect or DC++ or DC Elite, mainly P2P and set that it will block transfer only if downloaded file is avi, or mpg or any chosen extension. Second part of it is to tell the firewall to block only those IPs form whose are downloaded file containing given words. Example I’m adding DC++ to firewall and set blocking that IPs from with .avi file is downloaded if its jpg then don’t block . Second way I’m setting the firewall to block IP if downloaded file contain specific word or words, let say I add word “devil” so if P2P software will try to download “black [login to view URL]” it will block this specific IP and file will be impossible to download. It can be created by using any programming language but C# and .NET 2.0 is preferred Please place two bids, one for basic version and one for extended version and leave a note which bid is for what