ファイルの更新がされない

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Hello.Excuse me for the side question.

We are experiencing various problems in Excel and World at our university.

(1) When I try to open a file, the word “Open” is grayed out and I cannot open it.
(2) “Open” from the file preview does not respond at all.
(3) When saving a file, the “Saving” scale keeps moving, and when “Close” of the “Cannot save” window is pressed, both displays disappear, but each time the file is saved, Excel, which could not be saved, is saved on the desktop.

We would appreciate it if you could provide us with solutions to the above three problems.

Translated with DeepL.com (free version)