The Application "Finder.app" can't be opened. - 609

Understand, we are all working Remotely from all around the world. 

Therefore, we do not have the On-Hands experience the User ( you ) has with this computer.

The next best thing for us to having an actual On-Hand experience  with this computer is to follow the steps below

Download the Application Etrecheck directly from a well Respected ASC Contributor. And Safe to use.

The application is free or paid from added features. 

Run the application with Full Disc Access ( Security & Privacy - Full Disc Access ).

It will take a Snap Shot -  both the hardware and software.

 The Report will Not Reveal Any Personal Information. 

Post back the Full Report - copy and paste - using the Additional Text Icon ( 3rd Icon to last )

We can have a look at the report for possible issues and may have possible suggestions to resolve the issues.

Any Third Party Applications that will interfere with the normal operation of the OS,  is an invitation for disaster and comprising the Operating System

Any of the below should be removed as per Developers Instructions 

Below is only a partial list

This will include CleanMyMac , This will include BitDefender , 

This will included Norton Antivirus , Sophos Av Software

Intego AntiVirus, McAfee, MacKeeper, Avast AntiVirus

Ad Guard, Webroot , ESET

The The Built in Security  is all that is required.

Hello nsereivatana,

We would like to see how we can help you with Finder not opening as expected. Simply using safe mode may resolve this issue. What we need to do is see if the problem persists during safe mode. Here are the steps we’ll need to take to do so: How to use safe mode on your Mac - Apple Support

After the device boots into safe mode, try to reproduce the problem. Knowing whether or not the problem persists in safe mode will provide valuable insight as to how deep the problem may be rooted. Get back to us with your results and we can go from there.

Cheers!

I am seeing this as well.

The easiest way of dealing with it is to open terminal and type "killall Dock" (although it is not a full solution, as the issue re-appears) . This then recovers the Dock for a time.

Alternatively, right click the dock icon and "open new finder window" or whatever the app equivalent is.

[Edited by Moderator]

Restart in Safe Mode.

Does it show the same problem?

If you can, download the diagnostic tool Etrecheck and post its full report here.