Windows 7 64 Pro via Virtual Box stuck "unpacking windows"

Ubuntu 12.10 on Lenovo x230 Tablet I5 intel. Very new system, and older retail box DVD of Windows 7 Pro 64bit.

So far I have downloaded Virtual Box from the Ubuntu Software center and then started installing it via Gui. Windows starts its install process but stops during the unpacking process. I left it for 3 hours and it stayed unpacking.

How can I get windows/virtual box past this stage of the install?

Please make sure the appropriate selections in your BIOS are made. In particular, the virtualization options should be switched on. There a a few threads about this on the forum, but I have to run, so no time to search for you.