So I just bought Vegas Movie Studio 13 on Black Friday and I am getting this same exact error. I have tried using the disc that came with it and also the download and am having this same error.
Error Code: FINISH TXT ERROR: -2147163964 occured during installation
Module C:\Program Files (x86)\VEGAS\Shared Plug-Ins\Audio_x64\sfppack1_x64.dll failed to register. HRESULT -2147010895. Contact your support personnel.