Ok, so I know this thread is almost a year old, but just in case someone needs the info, you can boot to windows 7 from the grub prompt by entering the following commands:
grub> rootnoverify (hd0,0)
grub> makeactive
grub> chainloader +1
grub> boot
If your Windows 7 is not the first OS on the harddrive, or if it's on a second harddrive, this won't work.
Go to this website for more information about booting from grub:
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