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Install Windows 7;
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Install CentOS 6.4, choose "Basic Storage Devices -> ... -> Create Custom Layout", delete extended partition, create a root partition and a swap partition for CentOS;
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Verify the startup list;
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After installation of CentOS, login the system, you can edit /boot/grub/menu.lst to modify defaut startup system, default timeout, etc.
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During system startup, press up/down key before countdown over to activate the system boot menu to choose Windows or CentOS for startup.
That's it.