When installing Windows Server 2008x, a system reserved partition containing boot information is created. This will make a mess when you convert your HDD to Citrix Provisioning.
I found this guid from Daniel Ruiz on how to fix this: http://danielruiz.org/2012/07/23/windows-2008-r2-windows-7-citrix-pvs-system-reserved-partition/
It is good, up to the point that he does not set the active partition as a last step in Solution 2. This you will need to do in addition, if not you will have problems booting your image.