PS Elements will not fully load with Windows 11

Norman, to address the size of the interface (the tool strips etc.), try right-clicking on the Windows desktop and select Monitor Settings.  This should take you to a Windows dialog that looks something like my screenshot below.  (Mine is from Windows 10, but I assume you will see something similar in Win 11.  Try changing the Scale and Layout percentage.

As for the photo in your screenshot itself, it looks to be a very low resolution image.  Press Ctrl+0 and it will fill your monitor workspace, but I'm guessing it will be very pixelated.

And, finally, I have to ask why you are not using your more recent version of Elements rather than the old Elements 11.  I notice that you are using two different identities to sign into this forum.  If you made your prior purchases with different Adobe IDs, perhaps you have been looking in the wrong account for your software information and this will also cause problems when you are signing in and out of the program.

Norman, I have removed your screenshot because it contains your serial number.  Your Photoshop Elements program has already been registered, so you cannot register the license number again.  If you go further down the Products page from which you took the screenshot, you will see a download link for the registered programs and the serial number as well. 

Now, if you can use a DVD player for your Elements 11 program on your new computer, then all you need do is install from there and see whether the CC Desktop application has worked its magic.  You don't need to do anything with the CC application. It performs its work in the background.

If you don't have a DVD player for your program, then you can use the download link on the Products page of your Adobe account.  However, for Elements 11 the download link is split into two and you need to download both files to the same folder on your computer.  One of the files has an .exe extension and the other is a zip file that has a .7z extension.  There are options for both 32 bit and 64 bit versions.  Make sure you download the 64 bit option. Once you have downloaded both files, click on the exe file and it should install properly.   See my screenshot of the download files below:

Note that my screenshot cuts off the .7z download for the 64 bit version.

Once you get the program installed, you may find that you get a message that the program has been installed too many times.  If that happens, you should contact Adobe support as suggested by Peru Bob, and tell them that you only need to reset the activations for the license.

You can contact Support by telephone using the numbers listed here: https://helpx.adobe.com/contact/phone.html. Hours of operation outside of the United States are limited. See the phone link for details.

I am still thoroughly confused about which programs you have installed and are trying to install.  But try downloading and installing the free Creative Cloud desktop application:

https://creativecloud.adobe.com/en/apps/download/creative-cloud

You do not have to pay for any subscriptions.  However, it seems to be in charge of the licensing for some older Elements versions and downloading the application has worked for many users trying to  install older versions of Elements on their computers.

@Peru Bob, maybe I can make out the screenshot because I just had cataract surgery.  😉  It indicates that PCApp.exe - Adobe Application Manager is in use and needs to be closed before the setup file (which may also be the uninstall file) can proceed. 

@norm9704, reading through your several posts, I am now totally confused as to which version of Elements you are trying to install or uninstall.   In your original post you mention Elements 19.   That version is also known as Elements 2021. 

You also inidicate that you have installed Elements 11.  Your screenshot shows that you have Premiere Elements versions 11 and 18 installed.  (Version 18 is known as Elements 2016). 

You have posted in the Photoshop Elements forum, so I think both Bob and I have assumed you were talking about Photoshop Elements.

So, please clear up this confusion and tell us which program(s) you are talking about.  And if you are talking about Photoshop Elements which version(s) appear to be installed in Windows>Settings>Apps & Features?

Uninstall all Adobe, use the Cleaner Tool, and reinstall:

https://helpx.adobe.com/creative-cloud/kb/cc-cleaner-tool-installation-problems.html

If there was a problem with third-party plug-ins, you can press the Shift key when launching the Editor and you will be given the opportunity to disable them, which should allow the program to start.  If that isn't the problem, we need to have a more precise description of the error message.  A screenshot is most helpful.

Since you have been installing/uninstalling on multiple computers, it is also possible that you did not properly sign out of the program on one of the computers and you have therefore exceeded the activation limit.  If this sounds like an error message you have received, then the solution is to contact Adobe Support and tell them to reset all activations for the license.  However, so far, you have not described such an error message.