EasyBCD will set it up for your, just tell it you want a Legacy version and what partition number it is in. So, Windows 7 is on the 347 G and 156 G and XP on the 99 G?
So, you should end up with 3 boot entries beside the Boot Manager, 2 for Windows 7 and 1 for Legacy.
Easeus may be a good utility, but most folks here are more familiar with the representation Of Windows 7 Disk Management.
There is some really good info about using EasyBCD and dual booting on the NeoSmart Technologies site.