I run 3 OS's: Win vista, win 7, and ubuntu. Every month I reinstall windows 7 (because I dont have a key), and everytime I do that it reinstalls the MBR. After that, I cant access ubuntu. I have used live cd's to try and reinstall grub with no sucess. What is the easiest way to achieve this? I was hoping I could make a CD to pop in my computer that could reinstall grub as it should be, or atleast boot me into ubuntu, and work from there. But even if I get into ubuntu, I dont know the commands to reinstall grub with autodetect of the other OS's. I have fixed this problem before, but now I cant remember what I did. Any help would be greatly appreciated.