I have a Dell Vostro 3360 with 500GB+32GB SSD and I've installed dual boot Windows 7/Ubuntu 12.10. Everything worked fine till I upgraded the kernel version as I noticed that Windows 7 from GRUB menu disappeared.
I've tried several ways and hours to solve it but, I cannot make Windows 7 boot again.
Boot-repair (from Ubunutu or LiveCD) didn't solve the issue as it seems it doesn't see the Windows installation. Here it is the pastebin:
I even added manually the entries using Grub Customizer to boot directly from /sda3, but the error returned is "bootmngr is missing". Using a windows 7 recovery disk, the Startup Recovery option doesn't solve anything. Also, it doesn't see the previous Windows installation. The windows partition is already active (marked as boot) as I tried the solution from other posts.
Restoring MBR using Boot-repair for the first time, I was able to resume Windows (hibernation), but after shutdown I was no more able to boot in Windows. In that case, I think the Intel Rapid Start it was used as it for hibernation. Thus, I'm pretty sure that this technology is messing up the grub and booting as Boot-repair reports:
============================= Boot Info Summary: =============================== => Grub2 (v2.00) is installed in the MBR of /dev/sda and looks at sector 1 of the same hard drive for core.img. core.img is at this location and looks in partition 1 for (,msdos5)/boot/grub. => Windows 7/8/2012 is installed in the MBR of /dev/sdb. (sdb is the 32GB SSD).
As a last chance, I've even tried restoring the Dell factory image, but besides wiping my Windows, it didn't help at all.
Right now, I am out of solutions. If somebody has other ideas to try, it will be much appreciated.