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Thanks for answer. Instead of try re-install 16-bit support, I try copy a visual studio 6.0 (with some MFC and CRT debug file - I already C++ runtime 2005 so i only need debug) from other computer, and furtunately, it run. So now I don't need re-install 16-bit support.

I install Windows XP-Pro SP3 with 16-bit support option disable by nlite. Now my brother need Visual Studio 6.0 for his school. When I install it, it say "acmboot.exe is not a valid win 32 application" (setup file on iso image). Any one can tell me how to re-enable 16-bit support for my system.