Accessing Recovery Partition from VB

[awingnut]

I have what was a Windows 7 Pro installation (HP Ultra-Slim). I wanted to run Centos 7 on it instead so I install that as the native OS. However, I now have a requirement to occasionally run Windows applications so I've installed VirtualBox. What I want to do is use the recovery partition to install Windows on VB. Is there a way, and if so how, do I boot VB from that recovery partition? TIA.