you can download centos image from http://www.osboxes.org/centos/ once centos running, by default its network is off. enable the network by clicking the right upper corner settings. now run the following commands with root sudo yum install epel-release sudo yum install dkms sudo yum groupinstall "Development Tools" sudo yum install kernel-devel sudo yum install kernel-headers reboot click device > install guest additions cd images, and restart again. the screen resolution will be adjusted to fit. if you meet errors such as "your kernel headers for kernel cannot be found...", please go to /usr/src/kernels, and rename the kernel folder name to match exactly the version under /lib/modules
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