The corrupt file is opencl.dll and is caused by the NVIDIA driver installer that overwrites the opencl.dll from Windows with it's own. So everytime you install the NVIDIA drivers (new install or update) for your graphic card (via the NVIDIA GeForce or Windows Update), the opencl.dll file will become corrupt. What I would do is to install the latest NVIDIA drivers from the NVIDIA website, and then run the benchmark test after.