The error says "Check the spelling of the name, or if a path was included, verify that the path is correct and try again.".
Assuming the executable name is correct, is it in a directory included in your PATH environment variable? If not, use the complete path to run it.
Again, assuming the executable is in the C:\WinPE_amd64_PS directory, try "C:\WinPE_amd64_PS MakeWinPEMedia.exe . . ."