Hi erasmus,
I wouldn't always believe where bcdedit tells you bootmgr is.
In this case, it will be on the XP partition - I assume you had XP installed first?
Boot into 7 - go to folder options and make sure Hidden files and protected operating files are showing.
Have a look on the XP partition for bootmgr and a pale yellow boot folder.
Next open an elevated command prompt and type:
bcdboot c:\windows /s c:
then press enter.
Now look on your 7 partition - you will see them there.
Mark the 7 partition active ( in disk management, rt click 7 partition and Mark as Active).
Reboot to hand System status to the 7 partition.
You will now be fine to delete XP partition.