A：
1. Determine whether your main operating system is 64-bit windows system
2. If so, before you install virtual machine is selected centos64 bit
B：
Restart the computer, enter the BIOS setup screen at startup, different computer to enter BIOS setup are not the same, but not too far off, slowly start looking for tips in the interface. After entering the BIOS, find the Intel (R) Virtualization Technology of the settings to see if the start, I was Disabled, now set to Enabled, restart the computer after saving settings,
