problem in running windows 7 on ubuntu 12.04 via virtualbox

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http://askubuntu.com – I installed Ubuntu 12.04 last week. Now I want to use windows 7 on ubuntu via virtualbox. I installed the virtualbox and created a new machine namely 'windows 7', im booting through an iso image... when i start the virtual machine it does not run. It gives the following 2 errors: 1) "Failed to open a session for the virtual machine mint. The virtual machine 'mint' has terminated unexpectedly during startup with exit code 1. Result Code: NS_ERROR_FAILURE (0x80004005) Component: Machine Interface: IMachine {5eaa9319-62fc-4b0a-843c-0cb1940f8a91}". 2) "The VirtualBox Linux kernel driver (vboxdr (HowTos)