Imported Boot Camp (Win7) stopped working

Six years ago I installed windows 7 as a bootcamped system under a Mac OS X 10.6. Few month later I installed Parallels Desktop and used this bootcamped Win7 from that time on only over Parallels.
February 2015 I upgraded to OS X 10.10 and as a consequence of this activity I also upgraded Parallels from version 6 to version 10 - everything still beeing fine.
Last week I received an update message from Parallels to update to the latest build what I did. After starting the bootcamped Win7 over Parallels the installation of Parallels Tools' (new build) was started - but this failed.
After investigating a few web-sites I found several solutions for this problem - but before applying them I did an import of the bootcamped Win7 in order to solve the installation of Parallels Tools on the imported system and to keep my old bootcamped Win7 as a fallback. After a while I succeeded in finishing the installation of the latest Parallels Tools and so I had a running and well working "Imported Windows 7" as a VM under the latest build of Parallels Desktop.
After having reached all this I:

1. deleted the old Boot Camp partition with my fallback Windows 7 installation inside (but I kept the definition in Parallels Desktop,
2. made a new clean partition (HFS+) in that area of the former Boot Camp,
3. made a copy on OS level (.pvm -> .pvm) of the "Imported Windows 7" to this new partition,
4. set the standard directory path for VMs in Parallels Desktop to this new partition,
5. and opened this copy of the "Imported Windows 7" in Parallels to define a new VM.

Afterwards I tried to start this VM, but it failed with the notice that there is no operating system installed resp. no boot device could be found in this VM. I then tried to start the initially "Imported Windows 7" which then suddenly also failed (think I received the same error).
Afterwards I tried to change the harddisk 1 in the copied "Imported Windows 7" from the configurated Boot Camp partition (since it was an import of a Boot Camp system) to the hdd-image i found inside the corresponding .pvm file. But trying to boot this VM's configuration resulted in a Windows 7 start then entering into the repair mode of Windows 7.
I then tried to mount the VM's harddisk via the Parallels Mounter but the result was a complete system hangup of Mac OS X, so the partition of the disk of the "Imported Windows 7" VM is also not mountable.
So actually I have 2 VMs:

• A: import of my old Boot Camp Win7 ("Imported Windows 7"),
• B: OS-level copy of the imported Boot Camp VM (copied "Imported Windows 7").

none the two is working (neither with the Boot Camp disk selected in the configuration nor with with the .hdd-image selected) and none of the the two could be accessed via Parallels' mounting tool.

Reviewing the above I simply took the same actions as described in step 2 and 3 of the Instructions of http://kb.parallels.com/de/113658.

Has anyone any solution for this situation? At least I need to get some files out of one of my two remaining VMs I was working on the last days before this mess happened.

Thx, Frank