Photoshop menu items don't respond to click

I've searched to see if there's another question like this, and I haven't found any.

When I started Photoshop, the top menu and the side toolbar were there. But there's no response when I click on them.

I've tried restarting Photoshop, restarting my system (Windows 10), and deleting preferences on startup.

After I deleted the preferences, the side toolbar disappeared. Now there's just the menu along the top, which isn't responding to clicks. I just have a blank canvas.

I'd like to uninstall and install the latest version, or just upgrade to the latest version. I looked at the instructions for upgrading to the latest version (I have CC 2018) but it seems to require me to click on the menu item "help." 

How can I update? Or is there some other way to get this working?

I use a dozen other applications on a weekly / monthly basis, some of them are drawing apps, so I don't think the problem is my machine or my operating system. Also, I've used Photoshop for years with no problems.

Thanks in advance for any help or suggestions.