There are two places where your Excel program keeps the temporary save files. Try looking for your unsaved Excel files there.
Want to know what version of your Windows system is? Check out this post to learn how to view your system version information.
To take screenshots on your Dell laptop is easy. This post teaches you how to take a screenshot of the whole scree, the active window, or any area you want.
You can fix your Windows Update issues by resetting its components. This will clear the Update cache and restart its services.