VM 安装win7 Windows 7 fails to install; Status: 0xc0000225
Windows failed to start. Status: 0xc0000225

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I solved this same problem by modifying these VM settings:

changed chipset from PIIX3 to ICH9
enabled IO APIC
enabled absolute pointing device (although this is probably not important)

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from: https://forums.virtualbox.org/viewtopic.php?f=2&t=37628

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