Win 7 boot issue after ubuntu dual install - can't rebuild BCD

I have been struggling with boot issues ever since I decided to install ubuntu 14.04 LTS along Win 7 64 bits on myVAIO computer. To install it I chose "Something else" and resized the partition myself within the Ubuntu Installer. At first I got GRUB working and finding Win 7 but I could not start it. after this boot-info: http://paste.ubuntu.com/12215480/, I reinstalled GRUB in /sda using the following commands:

sudo update-grub
sudo grub-install /dev/sda

I got a seemingly quite common black screen from Windows Boot Manager saying this:

File: \Boot\BCD

Status: 0xc000000f

Info: An error occured while attempting to read the boot configuration data.

From this message, I found out that I needed to rebuild the BCD and then reinstall GRUB to get a working dual boot.

I have created a Win 7 64 bits repair USB and using diskpart, I know I have 4 primary partitions:

1 - 100 MB - It seems to me that the boot files are supposed to be there. According to DISKPART, it s the volume C: and labeled "System Reserved"

2 - 140 GB - Windows is installed on this partition. According to DISKPART, there is no volume associated with this partition and it is hidden

3 - 81 GB - Ubuntu is installed on this partition

4 - 999MB is SWAP

Auto repair from Win 7 repair usb does not recognize my Windows 7 and does not work. Therefore, I have to work with the command prompt. I have tried most available tutorial on rebuilding BCDs. Basically, when I run tutorial involving the following commands:

bcdboot c:\windows /s c:

I get: "Failure when attempting to copy boot files"

bootrec /rebuildbcd

I get:" Successfully scanned Windows installations. total identified Windows Installations: 1. [1] \?\GLOBALROOT\Device\HarddiskVolume2\Windows But when I try to add installation to boot list, I get: "The requested system device cannot be found"

My current boot-info is available here: http://paste.ubuntu.com/12231631/

I am definitely not an expert in this matter and I would really appreciate any good advice you can provide! Thanks a lot for your help.