Go to the virtual machine folder.
This is how to run a dual boot Windows 8 on Linux Mint / Ubuntu in Virtualbox.Install virtualbox.
Create a virtual machine without a disk.
In Virtualbox attach the new disk to the SATA storage setting.
Start the virtual machine.
Your normal boot menu will show, make sure you select Windows, it might not be a good idea to start the host OS as a guest in itself.
Windows will spend some time detecting new drivers, etc. and then boot up.
If Windows reboot too many times, try using the install DVD's repair function.