How do I restore Grub after Windows has deleted it [duplicate]

Possible Duplicate:
How can I repair grub? (How to get Ubuntu back after installing Windows?)

So I had a dual boot, with Windows, and Ubuntu, but I had to re-install windows for various reasons...

Now that I have re-installed windows, windows wrote over grub, which I knew was going to happen, but I didn't think about how to fix the problem, or if it was even possible... so here is my question, how do I restore grub to allow me to boot into windows and my already installed ubuntu?

There is quite a comprehensive guide on the Ubuntu wiki that should work for you. I suggest giving that a go.

I think you have installed win 7 after isntalling ubuntu in that case boot from the live cd download Grub Customizer Portable and then right click properties -> permissions and tick allow excecuting and then run it by double-clicking it and then go to File -> Install to MBR.