Hello mediaexpo, welcome to Seven Forums!
It's because the "new" Windows 7 is on an Extended partition / Logical drive and Windows OSs aren't capable of booting from an Extended partition, the boot files, the files needed to boot Windows must reside on a Primary partition.
Be sure to post back with any further questions you may have and to keep us informed.
To remedy this first the Extended must be converted to a Primary, have a look at Option One
of this first tutorial linked below.
Partition Wizard : Use the Bootable CD
Then you will need to use this tutorial to add/create the boot files to the C: partition.
Bootmgr - Move to C:\ with EasyBCD