computer hangs up regularly when two or more 3D parts are open, happens when minimizing one to open (maximize) another.

When I have two or more 3D parts open (Not particularly complex parts) and am minimizing the view  to maximize another part the program freezes and I have to go to the Task Manager to shut down SW, and reopen it.

 What is the problem my computer is equipped with:

SolidworksGeneral