This is the latest article in the series on dual-booting Linux and BSD desktop distributions with Windows 7. And this one provides step-by-step directions on how to dual-boot Linux Mint Debian Edition (LMDE) with Windows 7 on a computer with a single hard drive. LMDE is the branch of Linux Mint that is based on Debian, rather than on Ubuntu.
If attempting to dual-boot a distribution with Windows 7, it is highly recommended that you try as much as possible to keep them completely isolated. And if installation is on a single hard drive, that means letting the Windows 7 boot manager be responsible for dual-booting such that when you restart the computer, the Windows boot menu will look just like the one below.