Hyper-V Virtual Machines SID permission issue
If you want to move VHD files you have to take care on certain permissions on configuration files and directory rights. Otherwise you will not be able to start your VM.
For more details and how to solve this read this articles.
http://www.virtualizationadmin.com/articles-tutorials/microsoft-hyper-v-articles/storage-management/hyper-v-file-storage-permissions.html
http://architectevangelist.wordpress.com/2011/02/20/hyper-v-virtual-machines-security-group-issue/