I wrote on Friday "Problems with GRUB and d-i beta 4".
Well, I have just used a Daily build instead of Beta 4 and debian installer did recognize Windows during the installation.
But... if I try to boot it when GRUB appears, I still obtain:
Booting "Windows NT/2000/XP"
Filesystem type unkwnown, partition type 0x7
and Windows does not start.
Can you help me???