1. I had Windows 7 and Ubuntu installed on the same partition
2. Some time later, decided to uninstall Ubuntu.So I booted Ubuntu,Changed the `hd` related to it to NTFS,I did NOT extended my main drive
3. restarted-> `GRUB rescue>`. No surprise since I had just wiped out the whole GRUB directory staff
4. Now I just want to boot into my windows.Move my necessary files to an external memory and reinstall the windows seven

What I have in my hands:  

Ubuntu live CD, A copy of win7 DVD  

I tried to make use of the win7 DVD(I had lost my DVD) to fix the mbr but the problem is when I choose repair, It says that this version of Windows is incompatible with yours  

What should I do?