10 things you should do before, during, and after reinstalling Windows
Source: Alan Norton
There are some very good reasons why you might want to reinstall Microsoft Windows. Whether it is 2000, XP or Vista, the registry can become corrupted or it can accumulate settings for programs long since forgotten, leading to sluggish performance. Alan Norton documents the steps needed to properly reinstall Windows.
This download is also available as an entry in the TechRepublic Microsoft Windows Blog.