Virtualbox manager error when Ubuntu installation reboots

[vaadoo]

I have Virtualbox 4.3.2 version installed on windows 7, 64 bit
I installed Ubuntu 64bit 13.10 machine and the installation goes fine. Post installation, Ubuntu wants to reboot and then the Virtualbox manager gives error in Windows and windows tries to find solution online. Eventually, it can't find and I have to restart the machine again. But the Ubuntu machine goes back to reinstalling the OS as the previous installation is no where to be found.
I have also tried to install previous version of Virtualbox but with the same result.

[noteirak]

Remove the ISO from the virtual CD/DVD drive like told by the Ubuntu installer, and it will work.