I didn't realize the whole My DLL XPS 8700's Secure bootup will prevent me from installing Windows 7 Ultimate until today. Irritating, but at the end I accepted the fact. In fact, I couldn't even boot up the machine's partition if the machine was in legacy boot mode, yet I couldn't boot up Windows 7 Ultimate installation disc if it's in secure boot mode.
Windows 8.1 Pro installation disc can boot properly in secure boot mode, so that's why I used it and install the clean OS.
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