How to Dual Boot

I Need instructions on how to create a dual boot with Windows 7 already installed …

Dual boot: openSUSE 11.2 installation with Windows 7 - openSUSE Forums

The easiest way is to have two hard drives – one for Windows and one for Linux. If you do that the opensuse installer should automatically detect Windows and add it to the boot menu. Two hard drives also offer another fallback option: change boot priority of hard drives in BIOS to boot Windows directly.