Helping people with computers... one answer at a time.
This question comes up a lot for various, an quite legitimate reasons. Internet Explorer, or "IE" is one of the biggest targets on the internet for virus writers, spyware writers and hackers. Naturally, once in a while due to their efforts, or for other reasons, IE breaks.
In which case a repair may be called for.
Before we get into IE itself, though, most problems that look like they're caused by IE are not at all. As I mentioned, viruses and spyware may attack or use IE, but they don't necessarily damage it. The viruses and spyware are themselves the "damage". Poorly written add-ons can also manifest as problems within IE. In all these cases "fixing" IE won't help, you need to get at the root of the problem. My earlier article "IExplore.exe has generated an error." Now what? discusses many of the things to look at when you suspect, or experience, a problem in Internet Explorer.
So after all that, let's assume you've come to the conclusion that IE itself must be repaired.
We'll start with the first part of the question: How do you delete Internet Explorer? Answer: you don't. There are ways to disable parts of it, and even remove other parts of it, but the fact remains that Internet Explorer is a key part of Windows itself. It cannot be completely removed, and still have Windows work.
And in fact, that leads us to our first step in repairing Internet Explorer. Under Windows XP, run the System File Checker. This tool performs a check on all operating system components, including Internet Explorer, and repairs any that it finds are missing or damaged.
If that doesn't resolve the problem, or you're running a version of Windows that doesn't have the System File Checker, your next best option is a re-install. In fact, your best option in this case is to download and install the latest version of Internet Explorer from Microsoft's web site. This will repair your IE installation, or overwrite it with a fresh installation of the latest version.