title: ST-LINK V2 USB driver WinUSB Access Denied
body: <p>I have a Win7/64 development machine configured (by someone else I can't contact) to develop/debug an embedded project using an ST-LINK/V2 dongle. The PC detects and installs the dongle Ok but no application can access the dongle, giving <code>'No ST-Link device detected'</code> type errors.</p>
  
  <p>What makes this so frustrating is I have another Win7/64 machine that works flawlessly using identical driver, software and dongle and I haven't been able to transfer the dev environment between machines.</p>
  
  <p>I've found (using USBlyzer) that WinUSB returns IRP Status <code>STATUS_ACCESS_DENIED</code> to each dongle access request. I'm hoping someone has seen something like this before.</p>
  
  <p>P.S. "STMicroelectronics STLink dongle driver" is dated 28/07/2010.</p>