Windows 10: Windows Command Prompt is not opening...

So I was trying to open the command prompt and every time the command prompt opened for a short while and it closes by itself. I mean it just flashes for a moment and I can't see a thing. I created a new administrator account and tried to open it and it worked. But I can't delete my previous account just for the CMD issue since I've many important file in that account's folder and backing up those files are a pain in the butt.... So can I fix this issue without creating a new account in my computer??? I also have many Windows Store Games installed... So I don't want to delete my default account and re download those massive games....
Please help me ASAP..................................

:)

 

command prompt will not open in safe mode with command prompt

I am repairing a laptop for a friend and I need to access windows in safe mode and the owner has forgotten the password to the main user. I tried logging on with the administrator profile in safe mode but it is not showing up so I was going to use command prompt in safe mode with command prompt but command prompt will not open when I boot that option. Does anyone have any hints for me to figure this out?

 

command prompt will not open in safe mode with command prompt

Would I just follow the same steps within safe mode after hooking up to the other system?

 

.txt will open open in Command Prompt

I miss the Windows XP file association manager, it allowed you to select which of the commands would be executed when you double click a file (open, print, edit, etc...), it was removed since Vista.
Some good people created the Types application, which you can use to select the default action of the file double click, all you go to do is select the "txt" extension from the list, right mouse click, hit "Properties" and on the "Actions" tab right click "open" command and assign "Default" to it.
Hopefully this will solve your problems, although I think your PC is probably infected with some kind of malware that will continuously change that setting back, so I also advise installing some anti-virus like MSE or NOD-32 and preform a full scan.
Good luck.