Sorry I didn't get back to you sooner I've been sick.
The .msstyles is in C:\Windows\Resources\Themes\Aero folder, but like I suggested earlier you should create a new theme from scratch so you do not corrupt the original look at Post #38 Here
it will show you how.
I have no idea how to remove the icon in the top left corner.
To change the top frame you'll need to edit the images(with a image editor of some kind) at Windows and Caption Buttons > Aero > Dwm Window > Frames > Normal > Top
The close button would be at Windows and Caption Buttons > Aero > Dwm Window > CloseButton > Normal Button
The first time you click on the Edit button it will ask you to set a default image editor you will have to navigate to its .exe to set it.