Saving old and new Excel files

[Peggy Brother]

I have been using Excel for years. I have made changes and saved my files with no problems. I've created new files and saved them with no problem. Now no matter what I do, it will not save my changes or my new files. It says there is already a file by that name, but there isn't. When I try to save changes to an old file it says that I do not have the permission to make changes and I have to contact the Administrator. This is my home computer. How do I fix this?

 

[mole999]

use file explorer and look at the directory you were trying to save to. by default that would use *.* (i.e. all files). excel might mask what is visually returned *.xls and *.xlsx are different, if the excel is looking to save *.xlsx and only shows those, it wouldn't mean that *.xls is not already there