If you are using Virtual Box, VMware workstation 7 or older, you cannot install Windows 8. I have tried lots of trick but they didn’t work.
There is only way to install Windows 8 is using VMware Workstation 8. Moreover having VMware workstation 8 is not enough to install windows 8. Actually Windows 8 is not supported by virtualization companies because of it is not released.
1- Open VMware Workstation 8
2- Choose new virtual machine
3- Select Typical
4- Select I will install the operating system later
5- Other and Other 64-bit
6- Give a name and choose Path
7- Change disk size to minimum 20 GB
8- before starting customize Memory to minimum 1024Mb
Let’s run it