How do I tell DrakX to put GRUB on the MBR of the first drive,the one with Vista?
I do not know if this option comes at this stage during install
I have been confused in the past myself
just select the drive, if there is no option you can either install grub later
worst case it will end up on the wrong drive or partition, in your case it is fine
remember the rescue mode of the cd to reinstall grub if there was a problem