There's a good chance that it's opening inside the docking area, which is on the right side of the Inkscape window, and just to the left of the Snap control bar. Here's a screenshot of what that looks like. See the red rectangle:
dock.png
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(viewed 332 times)If you don't see the dialog docked, it might be sort of minimized there, or reduced to a tiny icon with some text. Here's what that would look like, in the red rectangle:
dockmin.png
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(viewed 293 times)Click on the text to open it.
You don't have to have it docked. If you'd like it to be floating, place your mouse in the green rectangle and drag it to the left.
If you still don't see it, there's a chance it's opening off the screen. But I haven't heard of that happening in Windows for a while. So I'm guessing it's probably docked.
Or possibly something went wrong when you installed Inkscape. But let's not worry about that yet. First let us know if you find it in the docking area.