Hello RayHalligan,
Welcome to the Microsoft Community.
I understand that you have different versions of Excel installed on your two devices, and that you are unable to open Excel files on your Windows 11 Home device, and understand how you feel.
Based on your description, you seem to have tried a number of options to troubleshoot the issue and I agree with your approach. In addition I would like to know from you about the reloading of Office 19 Home and Student that you mentioned, I would like to know from you how you did it? Is it a reinstallation of Office?
Have you tested if the problem occurs with specific files or with most Excel files? Suggest you try opening other files on both devices to check if it is a specific file or not.
Suggest you try the following options first to troubleshoot if it is an Excel issue:
1. Disable Add-Ins: You can click File -> Options -> Add-Ins, as shown in the figure, click the bottom to select COM Add-Ins and disable:
Excel COM add-ins and Automation add-ins - Microsoft Support
2. Modify the registry: sometimes by modifying the registry can repair some Excel problems, you can refer to this article to modify the
Registry keys that control the File Repair feature - Microsoft 365 Apps | Microsoft Learn
Disclaimer: Generally, modifying registry subkeys or work group is intended for advanced users, administrators, and IT Professionals. It can help fix some problems, **however, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For further protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs.**For more information about how to back up and restore the registry, click How to back up and restore the registry in Windows - Microsoft Support to view the article.
In order to better help you, we would like to test your file in the same environment whether it is still the same, in order to troubleshoot whether it is the Office version of the problem or system problems, if convenient, you can share the file with us by private message?
You can send a private message via the ‘Messages’ link at the top right of the page.
You can view sent private messages by going to ‘My Profile’ and selecting ‘View Private Messages’ in the left pane of your profile page.
I look forward to hearing from you further and if you have any questions, please feel free to contact me, thank you.
Best wishes
Isabella-MSFT | Microsoft Community Support Specialist