It does what Microsoft claimed was technically impossible, seperate the Web browser from the operating system. The procedure is safe and hassle free but like with any major operation like this, backing up first is a smart thing to do. The quick overview of how IEradictor works is a little like this. The program runs, IE gets torn out, your computer restarts, and you smile to yourself as your computer is magically quicker and more stable. Ah, the miracles of ingenious and efficient programming.
Several reasons come to mind.
Some people don't like being force fed a particular piece of software. There are lots of people who prefer Netsape's offerings or even the Opera Web browser. You don't know how many times I've solved problems on my computer by either updating to a newer version of Internet Explorer or simply just reinstalling the current version. All sorts of weird quirks and errors iron themselves right out after something like that. With IEradictor you can go a step further.