Are you Chris H?

It sounds like the workbook is protected.

Try Tools|protection.
Do you see Unprotect Workbook?

If yes, click on that (you may need a password to unprotect it, though).

If this works, it was caused by:

Tools|protection|protect workbook
and someone checked that Windows option.

Joodle wrote:

On one of my excel files, the buttons in the top right corner of the
spreadsheet window have disappeared. The window is therefore fixed in size
(open but not maximised) and I can't maximise it or close it. I've looked
through all the options and can't find out why this has happened or how to
restore the original settings.

Can anyone help?

Thanks.

--

Dave Peterson