That with "File -> New -> Window" you seem to get a blank Window.
The problem is that i don't get a blank window when I do that, so if you get a blank one you manybe have the "Right" settings.
May i ask why you can't use a different browser?
I was going to suggest you try changing the home page option to blank page,
I can't change software on the computer becaus it's not mine and it's a process with a lot of steps, ofc I can break some rules but thats not good. :(
Ofc I wold like running Firefox or somthing else.
Why did I not think of set the home page to a blank one, now i can use the shortcut on the desktop, and with pods tip to create keyboard shortcut i can use another keyboard shortcut than ctrl+n to do this.
I noticed that if I have a IE window open the new windows are not opend until I target one of my open IE windows, if I'm loooking at the desktop or something. But I can now use Ctrl + Alt + n.