Yes, I do that. You can make a partition for windows and then load windows onto that partition. Then you install RedHat on a second partition. When installing Redhat it has a bootloader called LILO. It will detect your windows partition and label it as dos. You can have either one load by default. When you want to boot into a particular OS, you will see LILO come up on your screen, you can hit control and type linux or dos to load into a particular OS.
