composer failed to read C:\ProgramData\ComposerSetup\bin

I am using laravel 5.2 in windows 10 using xampp and trying this command to work in git bash but every time it shows up with an error

[RuntimeException]
Could not read C:\ProgramData\ComposerSetup\bin
file_get_contents(C:\ProgramData\ComposerSetup\bin): failed to open stream: Permission denied

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