Error 0x80070666

Value: -2147023258 | 0x80070666 | 2147944038

What does it mean ?

ERROR_PRODUCT_VERSION  
Another version of this product is already installed. Installation of this version cannot continue. To configure or remove the existing version of this product, use Add/Remove Programs on the Control Panel.
Value: 1638 | 0x0666 | 0b0000011001100110

Where does it come from ?

FACILITY_WIN32  
Provides a way to handle error codes from functions in the Win32 API as an HRESULT. (Error codes in 16 - bit OLE that duplicated Win32 error codes have also been changed to FACILITY_WIN32)
Value: 7 | 0x007 | 0b00000111

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