I am having exactly the same problems trying to use easy bcd;
Quote:
Error Opening BCD Registry
The boot configuration data store could not be opened.
TThe syst4em cannot find the file specified.
Would you like to manually load a BCD registry for EasyBCD to manage?
I am following instructions here to create xp/win 7 dual boot;
Dual Boot Installation with Windows 7 and XP
Easybcd requests a BCD registry location and will not allow any entries to be created without it. I hunted around and as easybcd prompt mentioned something about running from a windows 7 boot loader, I found a BCD file location in the windows system32, in BOOT folder called BCD. Once selected it allowed me to use easyBCD. But when the time came to close the app and exit, it says;
"Unable to obtain exclusive access to D:\Windows\Bot\DVD\PCAT\BCD. If this is a removable disk, try ejecting and re0nserting it and then try again"
It is however NOT a removable disk, and it will not let me exit easybcd without dealing with this issue.