You try to launch MS Word and every time a little Installer window pops up saying “Preparing to install”, this usually happens when double clicking on a Word document. Word might load after that but usually will not load the document you try to open, you’ll have to open it from within Word using File -> Open. So how to get rid of this nuisance?

First try using this Windows Installer CleanUp Utility, if that doesn’t help then please read this article and try the three methods recommended.