I'm not too sure of your boot problem but this is what I would recommend:
Insert your Windows 7 disk and boot from it. When at the installation screen, choose repair at the bottom left corner of the screen and select Startup Repair
I'm not too sure of your boot problem but this is what I would recommend:
Insert your Windows 7 disk and boot from it. When at the installation screen, choose repair at the bottom left corner of the screen and select Startup Repair