I was having that exact same problem. Here's how I got around it. Instead of launching through Steam, navigate to where the Starbound executable is saved. Most likely C:\Program Files (x86)\Steam\steamapps\common\Starbound\win64 (or win32 if you need to use the 32 bit version) Right click on Starbound, and select "Run as Administrator". Unfortunately you'll probably need to do this every time until another fix is found, and you also won't get the steam interface in-game, but it will at least get the game running without any problems. To make things easier. Create a shortcut to Starbound and move it to your desktop, or wherever else you want it. Then right click that shortcut and go to Properties, click Advanced, then check the box for Run as Administrator.