Sounds weird. You get it minimized to the taskbar, or what? Or you close it, and can't get it reopened? Is this a common problem with other programs too?
Found by Google search "minimized windows won't open".
Hope you get it running well. If one can't help others themselves, one can help them to find help elsewhere - the best I can do right now.
"It's not really a matter of knowing everything, it's a matter of knowing where the know can be found", a common phrase when I was in our ~ High School. Today, it's a matter of Search Words.