I will walk through copying a bootable Windows 7 installation from a VirtualBox VM to real iron.
- Insert an external hard drive in the USB port and share it with your Windows 7 VM.
- Ask windows to make a system image "Control Panel -> Back up your computer -> Create system image", and save it to the external hard drive.
- Boot the Windows 7 install disk, click through, and select "Repair windows installation". The drives that you do not put on the exclude list, will be repartitioned and formatted, so make sure to exclude everything you want to keep.
- Let it chew on your backup, and when done, boot Windows.