Second partition with Windows 7 unmountable

I'm using GRUB2 to dualboot Ubuntu and Windows 7. I installed Windows 7 some days ago and rewrote GRUB2 to cope with the dualboot. Everything went fine till yesterday - I could boot into both OS.

Since this morning my laptop restarts every time I choose Windows 7 from the menu. Ubuntu is still working. As I tried to mount the partition with Windows 7 on Ubuntu it gave me return code 2, so this isn't working as well.

I tried to reinstall GRUB2 to the MBR but it didn't help. I also tried to repair Windows 7 boot with it's install DVD, while trying so it showed me the following error:

Windows Boot Manager  

Windows failed to start. A recent hardware or software change might be the cause.  
To fix the problem:

  1. Insert your Windows installation disc and restart your computer. 
  2. Choose your language settings, and then click "Next."
  3. Click "repair your computer."

If you don't have this disc, contact your system administrator or computer
manufacturer for assistance. 

  Status: 0xc000000f

  Info: The boot selection failed because a required device is inaccessible.

I had similar problem a few years back, solved it by starting ubuntu from the live CD, did a fresh install and that fixed the problem with the MBR partition. Then you can proceed to enter the windows CD and select repair fixing the Bootstrap of Windows OS. From then on every time you start you will get the menu option to select which OS you want.

If that menu does not appear enter again the ubuntu live CD start from there, restart and vuala! there they are.

Let me know if it dosent work out for u.

All the best