Gvim popup and bottom line message are garbled for enc=utf8 on Windows

I have [set encoding=utf-8] for the _vimrc file on a Windows 7 environment, which is a requirement for my current work. Under this setting, texts on the gvim popup alert, messages displayed on the bottom line and current file name display are all garbled being unreadable. If enc is unset or set to cp932, which is a Windows derivative of Shift-JIS, those texts are normally displayed but then utf8 text from file is unreadable.

How could I read normally those texts from the gvim system under the 'enc=utf-8' setting?

Thanks in advance.

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