If you plan to utilize Citrix XenDesktop 5.6 Personal vDisk and Citrix Profile Management, you will be required to make a registry modification in order for the Profile Management to work properly.
Citrix
Citrix Personal vDisk Failed to Start Status Code 7 Error 0xb7
How to resolve error “Citrix Personal vDisk failed to start.” on Citrix XenDesktop 5.6.