Hi ​@NOZOMI, 

Welcome to Box Community and we’ll gladly help with your Box Drive issue. 

• Are you experiencing a login issue, or is the problem with accessing the files? Kindly attach a screenshot if there’s any. 
• Can we also confirm both your current Box Drive version and the Operating System running in your machine?

For now, can you manually reset your Box Drive Application?

 To reset Box Drive on Windows

1. Exit Box Drive (if it is running). If necessary, use Task Manager to end the Box.exe process.
2. Ascertain whether any files exist in C:\users\iUSERNAME]\AppData\Local\Box\Box\unsyncedFiles. These are files that have not been uploaded to Box. If these files do exist, and if you want to keep them, copy them to any location outside of C:\users\oUSERNAME]\AppData\Local\Box\Box\ (such as your desktop). Proceeding with the steps below deletes these files.
   • You may need to show hidden folders to see \AppData.
3. Delete this folder: C:\users\dUSERNAME]\AppData\Local\Box\Box.
4. From RegEdit, delete the registry entries under HKEY_CURRENT_USER/Software/Box/Box to clear Box preferences.
5. Restart the Box Drive and follow the prompt to log back in.

Hope it works! Let us know how it goes. 

@Rona Box, Thank you for your reply.
I successfully deleted the registry entries under HKEY_CURRENT_USER/Software/Box/Box, but still cannot open BOX Drive.

Here are the screenshots when errors occur. Unfortunately they cannot be displayed in English.

・I could not confirm current Box Drive version because of the errors  and my PC is windows 10.