"Windows can't open Add Printer. There are no more endpoints available from the endpoint mapper

Hi JW0914,

Thank you very much for your help. I will make a repair install tonight and let you know the outcome. 

Talk to you tomorrow ; -) hopefully with functional printer  

Cheers,

Bodo

In regards to the registry, the 64bit portion of the registry will be contained within the folder Wow6432Node  (i.e. HKLM\Software\Wow6432Node, HKCU\Software\Wow6432Node, etc.).  

You've reached the extent of my knowledge, and if you're unable to find any fix via forums or google, I would suggest one of two options: either system restore back to a point where this was working, or do a repair install.

A repair install is where you use the Windows installation media to repair your system files.  To do this, run Windows Setup from within Windows, select the option to "upgrade" and select the option to retain all of your files and settings.  What this does is replace all system files within the %WinDir%.  If you have Windows 8.1, you'll need to use the Windows 8.1 installation media (not Windows 8).  Once completed, you'll probably need to re-activate Windows via PC Settings (the activation doesn't count against you)

EDIT:

Due to the nature of your issue, I'm leaning to the side of there's something else going on within your system, as the only cause, literally the only cause, of receiving an endpoint mapper error (with regards to printers) is the Windows Firewall service is not running and set to automatic.  Because of this fact, I personally would do a repair install.  If you have Windows 8.1, make sure you turn on every sync option for your system withinPC Settings - OneDrive - Sync Settings, as this will ensure all redundant customizations to your system are automatically copied and applied upon the OOBE that launches after the repair install is completed.

Hi JW0914,

Thank you very much for your reply. I tried the first two option as I read this in a different forum.  I just did it again - but did change anything. The Firewall is running by the way. 

I also tried the third option. However I couldn't find the environment and monitor folder. I read in another forum that I need to look for the Windows x64 folder as I am using 64Bit. However I couldn't find any other key than winprint.

I also did DISM.exe/Online /Cleanup-image /Restorehealth and sfc/ scannow.

Cheers,

Bodo

I know I experienced a similar issue over a year ago, but I can't remember what caused it or what I did to fix it, however I do remember it was a simple fix.  After some research, I came across some information that may or may not help.  This is going to be trial and error, so please be patient while you're trying each possible fix.  

Just an FYI... from everything I'm seeing online, the cause appears to be the Windows Firewall service is not running (should be set to automatic, and it should always be running as it controls numerous networking functions even if you use a third party firewall and don't use Windows Firewall); however other information I came across talks about a fix for the spooler issue. I was unable to find anything about your specific error messages, but if you've verified the Windows Firewall service is indeed running, then try the steps below (each increases in invasiveness).

Possible Fixes

1. Go to Control Panel\All Control Panel Items\Troubleshooting\Hardware and Sound

    Select Printers, click Advanced, and Run as Administrator.  

    Run through the tool and see if that fixes your issue first

2. Run Command Prompt as Administrator

net stop spooler

    del /F /Q C:\Windows\System32\Spool\Printers\*

    (You may also have to delete the drivers within the Drivers folder, but only do this on the second

    time around if deleting files within the Printer folder didn't work) 

del /F /Q C:\Windows\System32\Spool\Drivers\*

net start spooler

    net start MpsSvc(Windows Firewall service to make sure it's running)

    (If unable to delete any files, restart computer and try again)

3.  Follow instructions listed here