Make Windows Invicible
Notes from ClifNotes, Oct 2007, permalink Security Tools
This guy is a fanatic about making his Windows system files "bullet-proof". The info here is great. Just use caution and keep your system backed up before you make serious changes that may be hard to reverse.
Quote from the website
On these pages I offer pictorial, step-by-step instructions for locking down the core of your Windows operating system to help prevent malicious programs from launching. Every single mouse click is illustrated, in effort to make this procedure as easy as possible to follow. Links are also provided at the bottom of each page for you to download the lesson in PDF form, allowing for easy printing and viewing offline.
http://invincible-windows.blogspot.com/