

Added to this I cannot turn off my computer using the left click on the mouse. Consequently I cannot access Microsoft office 'word' or any of the other apps on the start menu. Click your avatar (profile picture or initials) in the upper right. I can't access/see the start menu when I turn the computer on, however I can see my files.To reinstall the Dropbox system extension: Hit the Power button and press Shift before the Windows logo appears. If you’re on Windows, macOS 11 or earlier, or Linux, and you’re having issues opening online-only files in the Dropbox desktop app, you may be missing the Dropbox system extension.
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Learn how to update your system preferences.

If you’re on macOS 10.15 or earlier and experiencing issues installing the Dropbox system extension, you may need to update your system preferences to allow the blocked system extension.If you're having issues opening online-only files on macOS 12.3 and above, you can open them directly in Finder.Installation of the Dropbox system extension is not applicable to macOS 11 or later.If you’re on a Dropbox team account, an admin on your team can restrict your ability to install or uninstall the system extension.The Dropbox system extension doesn’t apply macOS 11 or later.It allows you to open online-only files from File Explorer (Windows), Finder (Mac), or third-party applications. Click the Start button, hit the power icon, and then hold Shift while you click 'Restart.' Alternatively, you can hit the Start button, in the search bar type 'Change Advanced Startup Options' and then hit Enter.

The simplest way to access the BIOS is with the Start button. The Dropbox system extension is automatically installed when you install the Dropbox desktop app. There are a handful of ways to access the BIOS from Windows 10.
