Thank you Saltgrass,
Yes, there are the System Reserved partition, and don't has letter!
First I use EasyBCD 2 beta, and also I tried with Version 1.7.2, but the same thing.
C: and D: are two partitions in the drive where is Windows 7 installed.
F: and G: partitions are respectively C: and D: partitions in Windows XP drive.
In XP the boot.ini is default:
multi(0)disk(0)rdisk(0)partition(1)\WINDOWS="Microsoft Windows XP Professional" /fastdetect