i installed my windows 7 on my secondary partiton, it worked, and then i installed vista on the first partition, then i discovered that by doing that i destroyed my windows 7 MBR and BOOT info, so now when i boot, i see only vista, even though all the 7 files are intact in the secondary partition. i tried the repair console from win7 dvd, but in the OS selection menu, i see only Windows Vista. what to do?
If doing a dual boot always install the oldest microsoft os first. If you do new then old you will have to repair the master boot record using bcdedit or third party software
You can also just boot from the win7 dvd, select your language and than click on 'repair your computer'. Once it has searched for windows installations, make shure the upper checkbox is selected, on the next screen open the commandprompt. Type bootrec /fixboot then bootrec /fixmbr (it could be that the last one isn't necesary after you've done the first). this writes a new bootsector/mbr to the harddisk wich compatibel with win7