Only Windows Exlorer will open in Windows 10

Just installed Windows 10 on my Lenovo T500 64 bit. Previous version was Windows 7. After trying to enlarge the desktop and taskbar icons I am now only able to "open" Windows Explorer. I know that the application is ruing but I only can see the desktop screen. It is very frustrating because I can't even see or use the Prompt or Run command.

Please advice.

Send from my iPad.