Unable to start windows 7

I have upgraded my ubuntu 12.04, with fhe following command.

sudo apt-get upgradeIn between some parts were not updated because of some internet issued. So, I had to again run the same command to again start the same upgradation process.

But after that i am unable to start my windows 7. Have no idea why

Instead of window's 7 Its showing Memtet86+, serial console 115200. Searched all over the internet applied most solutions from SOLVED answers but still no use.

Boot info Summary

One more strange thing, when I do grep menuentry /boot/grub/grub.cfg There is no info on windows 7, It provides me following info:

menuentry 'Ubuntu, with Linux 3.8.0-44-generic' --class ubuntu --class gnu-linux --class gnu --class os {
menuentry 'Ubuntu, with Linux 3.8.0-44-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os {
menuentry 'Ubuntu, with Linux 3.8.0-42-generic' --class ubuntu --class gnu-linux --class gnu --class os {
menuentry 'Ubuntu, with Linux 3.8.0-42-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os {
menuentry 'Ubuntu, with Linux 3.8.0-41-generic' --class ubuntu --class gnu-linux --class gnu --class os {
menuentry 'Ubuntu, with Linux 3.8.0-41-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os {
menuentry 'Ubuntu, with Linux 3.8.0-39-generic' --class ubuntu --class gnu-linux --class gnu --class os {
menuentry 'Ubuntu, with Linux 3.8.0-39-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os {
menuentry 'Ubuntu, with Linux 3.8.0-38-generic' --class ubuntu --class gnu-linux --class gnu --class os {
menuentry 'Ubuntu, with Linux 3.8.0-38-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os {
menuentry 'Ubuntu, with Linux 3.8.0-29-generic' --class ubuntu --class gnu-linux --class gnu --class os {
menuentry 'Ubuntu, with Linux 3.8.0-29-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os {
menuentry "Memory test (memtest86+)" {
menuentry "Memory test (memtest86+, serial console 115200)" {

Can anybody provide me the solution for this, as m unable to understand whats going on. Also dont want to corrupt MBR, GRUB etc with various hit n trial. And dont even know that I have already corrupted it. Have a very little knowledge of this linux n file systems so dont know whats going on.

EDIT

Output of sudo fdisk -l

Disk /dev/sda: 250.1 GB, 250059350016 bytes
255 heads, 63 sectors/track, 30401 cylinders, total 488397168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x5fa00889 Device Boot Start End Blocks Id System
/dev/sda1 * 2048 206847 102400 7 HPFS/NTFS/exFAT
/dev/sda2 206848 209717247 104755200 7 HPFS/NTFS/exFAT
/dev/sda3 209717248 347870802 69076777+ 7 HPFS/NTFS/exFAT
/dev/sda4 347871230 488396799 70262785 5 Extended
/dev/sda5 347871232 484356095 68242432 83 Linux
/dev/sda6 484358144 488396799 2019328 82 Linux swap / Solaris

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