Weird BCD (Store) Phenomenon in Dual-Boot Setup

Hello,
as regularly i did some backup to an ssd lately. It has the following (MBR) partitioning (The drive letters are as seen in Win-7):

1. (X:) Win-XP: System, Primary Partition
2. Extended Partition:
    (D:) Data: Logical drive
    (C:) Win7: Startpartition, Logical drive
    (F:) Free: Logical drive
3. Active Primary Linux (ext4) Partition

The BCD resides in X:\boot\. As usual in my setup, there is no additional 100MB System Partition on the disk.
This setup works perfectly on several disks.

Now, yesterday after the backup, i booted successfully in all the three OS'es consecutively (for some configuration tasks):
into Linux, then in Win-XP and finally into Win 7. Everything fine.

Then, by chance, i opened the Visual BCD Editor - but it didn't start: "Run Applicatin with Admin privileges" error message.
Just like described here.
Though, it is possible to start Visual BCD Editor with  "X:\boot\BCD"  as argument  from the commandline - but it can't Backup/Save it then.

There is no Registry Hive  HKLM\BCD00000000  in the registry  (See here).

However, it's possible to mount the BCD (from the Win-XP primary partition X:) with
reg load HKLM\BCD00000000 X:\boot\BCD
But that doesn't change anything for (Visual) BCDedit:

bcdedit /enum BOOTMGR
The Memory for the Startconfiguration couldn't be opened
The System can't find the specified file

bcdedit /enum OSLOADER
The Memory for the Startconfiguration couldn't be opened
The System can't find the specified file

What strange kind of amnesia is this: Win-7 can (dual-) boot perfectly, but it lost the information, where the BCD is?
Where does it believe that the BCD is?
And, more importantly: how can i tell him, that it's in X:\boot?

Edit: Please don't bother!

After cloning the first (X:) Win-XP partition, i forgot to remove the existing X:\Boot folder. So Win7, while installing, obviously was aware of another Windows on the System. After deleting the existing X:\Boot folder, a fresh installation went flawlessly...

Edited February 17Feb 17 by Mark-XP
Edit