(!) If you want to install the new operating system using CD/DVD, in OS Selector go to Tools -> Options -> Startup Options and make sure that option Do not load CD-ROM drivers is unchecked:
(!) If you want to install a new operating system from floppy and floppy is not present in the Operating Systems list, create a new Boot from floppy item: select OS -> New -> Boot from floppy in the menu.
If you need to install several copies of the same Windows operating system (e.g. two or more copies of Windows 7, each having its own properties and software sets) you can use one of the above methods for installation. Alternatively, you can use Operating system copy feature: program will fully duplicate contents of Windows, Program Files, Users, and Documents and Settings folders, including all software installed inside the hidden BOOTWIZ system folder.
To copy an operating system, select it in the list of operating systems and choose Edit -> Copy:
(!) The copied system will reside on the same partition as the original system. Operating system copy does not allow copying a system onto a different disk/partition.