This might be the browser crashing, and you can try:
- Press Ctrl + Shift + Esc to open Task Manager
- Find your browser under the Head "Processes". Click on it and then click the "End task" button on the bottom right

If it's not working, it is probably caused by the Windows Explorer. You can try:
- Press Ctrl + Shift + Esc to open Task Manager
- Find "Windows Explorer" under the Head "Processes". Click on it and then click the "End task" button on the bottom right
- If the Windows Explorer doesn't restart by itself, in which case the taskbar is missing, Click "File" and select "Run new task". Enter explorer.exe and click "OK".

The danger of disconnecting the USB device and force shutting down while transferring data is corrupting the data in the device, so if nothing works eventually this might be an option.
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