* You could remove the drive, place it in another system with a CD drive, and install Linux there, then put it back in the first system.
* You could do a network install
, booting first from a floppy or usb drive. This can even be done without access to the internet, if you have another system to act as a server.
* You can install from within an existing installation (Windows
). These will require that you copy the install image over (perhaps using a usb drive).