Went to mount one of the VHD's off one of the 2 5TB externals I got to hold them and get this.

Any solution to get windows 7 to not be so picky about the drive that the VHD is sitting on? Will I have to dust off an old small HDD to transfer them to temporarily or is there so way I can process the VHD or else mount it via something else to get it to actually work?
Read only is fine.