Installing Ubuntu 12.04 on Virtualbox4.2.18 causes the VM to crash. This has happened twice already

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http://askubuntu.com – I am installing under Windows 8 64-bit. Installed Oracle Virtualbox 4.2.18. Downloaded Ubuntu 12.04 LTS ISO. Created a new VM and tried to start from the ISO file to install Ubuntu to the VM. Process of downloading third party software packages and installation runs a few hours and then apparently everything has been installed. It asks for a reboot when I do that it crashes. Next time around it asks if Ubuntu should be reinstalled. I have gone through this process twice already with no success. Please help if you have a solution. (HowTos)