Helping people with computers... one answer at a time.
If you get the "Window Installer, Preparing to install" each time you boot Windows, there are a couple of resources to check out.
Why do I get "Window Installer, Preparing to install" each time I boot Windows?
In a nutshell, it depends. Typically it's an artifact from a previous install that didn't complete. But there are a couple of resources that might help:
How do I stop Windows Installer from loading? is a thread out on the Annoyances.org discussion board that covers the topic. Windows Installer Appears Every Time I Start an Application is a related article, also on Annoyances.org.