How to configure administrator permissions

Did you created the files on the current computer and with same user name or were they created on another computer and with different user name ?
If you created a file on the current computer you should be able to open and edit.
If you created a file on another computer that has a different user name, the file can't be opened or edited on the current computer as they belong to another user (C:/Users/"Name" are different)

In this case you must take ownership of the file
Add Take Ownership to Context Menu in Windows 10

@Nevadasan And thank you for your reply. Good luck.

Nevadasan said:

In the partitions of other SSDs that have Windows installed, I also cannot create files or save them

I can't comment because I don't know where in those partitions you are unable to create or save files.
If I need to edit a file [a very rare event] within Program files, I back it up to an external disk, copy it to the desktop, edit it then copy it back into place.

I have a folder tree of my own on the C:\ drive to which I've applied the same protections as Program files.
It contains my scripts and also portable apps.
I have a matching folder on another drive where I create, edit & test my scripts. When a script is ready for use, I copy it into that special folder on all my computers for general use.
Set up my Tools folder ditty - TenForums


All the best,
And thanks for the rep,
Denis