This bug isn't solved, look at bug #475881
In bug #486499 user mentions about a workaround, but it doesn't help in my case.
In bug #454930 you can find similar problem, but with Windows XP.

>From my investigation I found, that windows bootloader is starting and
loading some files, but after initialization process it wants to access
files via root drive and can't find this files. My Windows 7 64bit
always reboots without any BSOD or error message, so it is only my
guess.

I have tried using some workaround, like removing search command, but
nothing helps. At last I installed Grub1, it works like a charm, but for
not so experienced user it will be too hard to fix.

To make things 'worse', on second computer with similar configuration
everything is OK. It has Windows 7 64bit on sda1 and Ubuntu 32bit on
extended partition (sda5 or sda6 ext4). Disk is SATA2.

I don't know how exactly grub2 works, but maybe it wrongly passes root
disk to windows or can't find it?

My SDA partitions:
Disk /dev/sda: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x000e1244

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1        8924    71681998+   7  HPFS/NTFS (windows root 
- c:)
/dev/sda2            8925       60671   415657777+   f  W95 Ext'd (LBA)
/dev/sda3           60672       60801     1044225   82  Linux swap / Solaris
/dev/sda5            8925       50333   332617761    7  HPFS/NTFS (partition 
for data)
/dev/sda6           50334       54223    31246393+  83  Linux (root /)
/dev/sda7           54224       60671    51793528+  83  Linux (/home)

-- 
grub2 Windows 7 fails to start.
https://bugs.launchpad.net/bugs/402154
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