I have Windows 7 installed; Ubuntu 12.04 is installed using Wubi.
Now, I want to install Windows 8 too; I know it is possible; but do not how ?
Can anybody help me to install 8 setp by step without any trouble.

I would suggest that you consider running one host operating system, then install a virtualization App such as Virtual Box. Finally run the other target operating systems as guest virtual machines.

This config simplifies the installation of all of the operating systems, and also allows you to run multiple operating systems at the same time on the same hardware.

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