virtualbox.org

I recently downloaded virtual-box 4.3.26 on windows 8.1 64 bit host. I want to use Ubuntu 14.04 64 bit as guest in virtual box. But is isn't showing any 64 bit os options? what to do? Please help.

FAQ: I have a 64bit host, but can't install 64bit guests.

Thanks for your reply. I will do as mentioned in FAQ.