Hello Karen,
I wish I could say that I have a solution for you, but I don't. But if it is related to the specific PC it's hard, and frustrating.
I'm not a IT person, but maybe Windows Event Viewer can help you. As I understand it logs what is happening on the PC, and maybe you can see if there are any errors when you run the debugger??
I don't know exactly how this tool works, but you can probably find more information using google.
I will follow this thread and I really hope someone has a solution or tip on how to find and fix errors like this.
Good Luck