O365 has stopped working on our PC using Windows 10

We understand that support for Windows 10 has ended, but why are we unable to use our Word and Excel programs?  I have paid the annual renewal fee.  When I log in to my Microsoft account it says that the account is active on my laptop but has been disabled on our PC.  Our PC is an older computer which can't run Windows 11 but is otherwise sound.  We have files on this computer which we need to access.  When we try to open Word or Excel we get a window saying "Something went wrong. Please try again later.  0X80070426" which indicates that an update has been unable to install, presumably an update for Windows 11.  Is there a way to turn off updates for Word and Excel and use them in their prior (perfectly acceptable) version?  I can't get an answer, or a person, from Microsoft.