Not able to Shut Down computer properly after doing a recent software update

Here are a couple things to try.

1) Try resetting the NVRAM. The NVRAM is a special memory section on your Mac that stores data that persists even when the Mac is shut off, such as volume settings and screen resolution - it's the information the computer uses to maintain settings after a reboot. You may have to do this several times because sometimes that's what it takes to stick. Hold the keys on startup until you hear the Mac chime three or four times, then release.

Reset the NVRAM

How to Reset NVRAM / PRAM on your Mac - Apple Support

2) If rebooting or resetting NVRAM doesn’t fix things, see if the problem still happens in Safe mode (hold the shift key down at startup). It can take much longer to safe boot (10 min) so be patient.

How to use safe mode on your Mac - Apple Support 

Safe mode disables loading third-party drivers, forces the OS to do disk repair, clear certain caches and logs and other miscellaneous housekeeping. It's non-destructive to user data so is safe to do. Very often certain weird software behavior is corrected by simply logging in this way as a troubleshooting method. When you're in safe boot, the machine will not be at its best performance, especially with graphics, but that's expected.

Does the problem persist while in Safe mode?

Exit safe mode by restarting your Mac normally and re-evaluate the issue again.

If the problem is still unresolved, please return here and post a reply and we’ll see what else we can come up with for help.

I have tried shutting down my computer by holding the on/off button, yes this works but when I restart it, it won't shut down property again, just restarts itself. this problem was initially after one of your updates. You need to fix this. I can not afford to get a technician to come in. Also I have tried force shutdown on the apple logo. it will shut down everything except finder. why is this so.

To turn off an unresponsive Mac, press and hold the on/off button for 30 seconds. This will shut the Mac down, then try a normal restart.

Finder is integral to the working of MacOS and cannot be shut down, all you can do is refresh it. So when starting to a clean desktop you will always find Finder is running.