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Oracle Virtual box (v 4.3.4 r 91027) installed on a Windows 7 x64 throws a Failed to attach USB device STMicroelectronics STM32 STLink[0100] to the virtual machine .. .. is busy with previous request..

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Can you provide the log file for Virtual Box? –  Ramhound Dec 2 '13 at 15:19

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As I spent somt time googling the answer, here is what helped me out: https://forums.virtualbox.org/viewtopic.php?f=6&t=59303

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Welcome to SU. While your link might provide the answer it can quickly before outdated or removed. Can you include the main information from the link in which answers the question in your answer and provide the link as a source. Thanks. –  Matthew Williams Mar 31 at 7:42

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