You can do it, but only by combining taking a Screenshot, with the functions of the Snip Tool;
Click on Start for the Menu.
Press the "PrtSc/SysRq" keyboard button for the Printscreen.
Click on and open "Paint".
Press keyboard buttons "Ctrl+V" will bring up the screen-shot of your desktop, with the Start Menu captured and superimposed.
Click and open the "Snip" tool, and use as per normal, to snip-out the Start Menu.
I do this all the time if I want to keep a filed record of any of the Drop-down etc. Menus that I may wish to refer back to. An Archive, if you wish.
Here's an example just done of my " >> Quick launch " Menu, produced by my outlined method;
Hope that this works for you. However, if your Start Menu extends from the top of your Desktop, to the bottom, just do it in two overlapping sections, and if you're really keen, any good photo software will allow you to 'stitch' the two sections together.
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