"File Operations error : 4000 (10)"
The "10" part is the internal windows internal error code. And this error is uncommon, 10 means "ERROR BAD ENVIRONMENT", and it is a generic error returned by Windows when something is corrupt or if the file system is damage, or missing system files.
Can also be that some security software. Blocks hard when MC tries to overwrite existing, and force that error back to the calling app.
Take a look in the windows event log, You might find more information there