Comment 36 for bug 610898

@Mayukh,
It sounds like you have a different problem, perhaps specific to your computer. This bug is specifically related to grub updates that result in the grub bootloader being installed over the windows bootloader. I'm guilty too of bringing up a recent grub issue but only because I mentioned this symptom in the bug description "side note": that a Wubi installed on the same partition doesn't boot - but it never evens gets to the grub menu. Whereas in your case, you must be getting to the grub menu. I would guess that your bios is flipping your drive devices. Or something else, but if it was a widespread issue with Wubi since grub2 was introduced in 9.10, I think that would have been evident by now.