This is a bug in hadoop and still exist in 0.21.0.
If you want to run hadoop in Windows you will need Cygwin
Especially the chmod program.
You should just need to add Cygwin’s “bin” directory to Windows’ PATH:
* Control Panel -> System and Security -> System -> Advanced System Settings
* Click on the “Advanced” tab
* Click “Environment Variables” button
* Select “Path”, click “Edit”
* Add “;C:\cygwin\bin” to the end of the “variable value”
Assuming that you installed the Cygwin in “C:\cygwin\” add semicolon if needed before the path, please refer to your installation folder of Cygwin.