If you receive:
<Your Command> is not recognized as an internal or external command, operable program or batch file, it may be that some application install changed the Path value name, in the registry, from a REG_EXPAND_SZ data type to a REG_SZ data type.
To fix the problem, use Regedt32 to navigate to:
If the Path value name is a type REG_SZ, double-click it and paste the data value into notepad.
Delete the Path value name.
On the Edit menu, Add Value name Path, as a REG_EXPAND_SZ data type.
In the String Editor, paste the data value.
You may have to restart your computer.
See tip 1907.