Regardless of how messed up your installation is, the original installation media will work fine. Furthermore there are plenty of places where you can obtain (including MSDN and TechNet) original copies of the ISOs to install the operating system. Provided you have the legal license.
Lastly, even if someone DID write said example, you would not be able to compile it if your DXdev installation was so corrupt. Furthermore, even if it was corrupt a simple re-installation would fix that.
Lastly, I highly doubt you have 20+ experience in anything software development related. I HIGHLY suggest you stop claiming that.