Hello

I am new here, and I hope that I am posting the right place. I apologize if it is not.
My question is how to run Windows and the Server on the same machine. If this question has been answered I apologize, and would appreciate the related links. My searches did not provide the information that I was looking for.
I just came across this server by accident this morning, and I am very intrigued. I am a huge fan of opensource software.
Anyway, my question is about the installation. The installation states that it will format all hard drives that are attached. How do I make my machine, a server and windows machine?
The machine that I use at work is the company server machine, but it has windows installed on it, and I use it the same as any other computer. Can I do that with this program?
I think that a windows installation will format the hard drive too if I remember correctly, so I don't think that I can install windows after the server.
Is there an option, when installing the server, to partition out the hard drive space that has windows installed?
Okay, that is all of my questions I think. LOL Even if you have a link that provides this information, that would be great. Thank you so much.

Thank you so much!
Kristin