The Debian Installer Loader runs on most releases of Windows. It will allow you to run the netboot (or netinst) image of Debian to install Linux side by side Windows.
No CD, USB or Floppies are needed. All that is required is an internet connection. The Loader will download the current Linux kernel, initrd (ramdisk image). It also installs grub into the Windows boot loader (ntldr or bootmgr; chainloaded).
Automatic 32bit (x86) and 64 bit detection decide which kernel and initrd is best to use.
After you install and reboot, a new menu option "Debian Installer" appears, from which you can launch D-I. The current copies of D-I offer partition resizing, so your ext2/3, FAT32, or NTFS partition can be resized to make room for Debian. After it's done, you'll have a "side by side" installation of Debian with Windows.
More Details are available at: http://www.goodbye-windows.com/debian/?from=google+code
FOSS contributions that make this possibleDebian GNU/Linux - http://www.debian.org/ Linux kernel - http://www.kernel.org/ grub4dos with ntfs support NSIS installer
These details are provided for information only. No information here is legal advice and should not be used as such.