On a brand new copy of Windows 2008 I had to open up Internet Explorer and download a program to install.  The only thing stopping me was the Internet Explorer Enhanced Security!  Every url that I went to or loaded was prompting me to add the site to the "Trusted Sites" lists before I could browse them.  This can quickly become annoying and also stop you from accomplishing the simplest of tasks.  Thankfully, if you know where to look, disabling Internet Explorer Enhanced Security is a breeze.