Dual Boot. Broken Windows 7 MBR and Grub

I had same issue. After trying other solutions on the internet, I ran from Ubuntu terminal:

> sudo update-grub

It located the Windows and Ubuntu installations automatically fixing the boot issues.

Hope this helps someone.

There is no way to fix the windows 7 bootstrap from Ubuntu, you will need to do so with the windows 7 DVD but, which size is sda1, if it is +/- 100Mb, you should not have much troubles fixing it but, will need to reinstall grub to another partition. If it is way bigger than 100Mb, this mean it was not the system reserved space and that you have installed Grub over your windows 7 thus, deleting windows 7 completly....

• Here is a link for a recovery ISO,download and burn it into a cd.
• Boot with your Windows 7 recovery disk.
• Hit Enter at the language selection prompt and then hit R for Repair to get to the Repair section.

• Select the command prompt and type in the following command

  bootrec.exe /fixmbr