If you have more than one operating system installed on your PC, a tool like Easy BootManager will be very useful to you. It lets you install up to 12 operating systems on the same PC, each one independent.
You can choose if you want to install the systems in the same partition, or in different extended partitions. With a practical assistant you can access all the management functions of Easy BootManager. When you start the PC, all the installed systems automatically appear, and you can choose the one you want via a menu. If you choose none, the program will choose the last one you used.