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Al's picture

Pete,

To fix the msvcr.dll problem try installing Microsoft Visual C++ 2010 Service Pack 1.

I now understand what you mean about the drives, I was thinking it was an extra external drive.  It really does sound like the RTLSDR driver directory is not pointed to by the system's PATH variable.  SDR# uses a driver in it's own directory but the 'pyrtlsdr' library, which the software uses, requires the driver to be in the PATH.