Missing Android Device Monitor and adb?

I am using Android Studio 3.0.1 and have not needed to use the Android Device Monitor or adb yet. In the video it looks like there should be a button next to the "AVC Manager" that opens the Android Device Monitor but it is not there for me.

I did find it in the menus under Tools -> Android -> Android Device Monitor, but when I try to launch it I get an error (in a popup that won't let me copy and paste) and it fails to start.

I did a google search for Android Device Monitor issues and found a result that suggested running Android Studio as Administrator. Tried that got the same error.

I then tracked down the executable in: C:\Users\xxx\AppData\Local\Android\Sdk\tools\lib\monitor-x86\monitor.exe

I can run it there, but it requires me to detach the debugger, and the data folder on the emulator won't open so I can't see if the files were created or not.

I then tried to use the adb shell and got this error:

C:\Windows\system32>adb
'adb' is not recognized as an internal or external command,
operable program or batch file.

I get the same using the terminal in Android Studio.
Are these things that I need to set up? If so how?