I would suggest the use of the Windows System Reserved partition to contain the "System" boot files, this way is very easy to add or remove a second or third OS to a multi boot setup, have a look at this tutorial at the link below for some ideas and be sure to post back with any further questions you may have and to keep us informed.
System Reserved : Create for Dual Boot
System Reserved : Create Using Disk Management
Or perhaps you would prefer something like this.
How to Create a Windows 7 VHD at Boot to Start with from Boot