Installing ubuntu on separate disk makes windows stop booting

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http://ubuntuforums.org – Hi All, I'm fully aware that I must be doing something wrong when installing, but I have ruined a perfectly good windows install so-far and would like some advice to check I'm doing the right thing ;) My set-up is a home-built desktop build with multiple hard drives. I have a windows dedicated drive and would like to install Ubuntu 12.04 to another completely separate physical disk. So far, I have wiped both install disks intended for win7 and ubuntu, installed win7 to the first drive, and booted into that numerous times. No problems... Next, I installed ubuntu whilst having disconnected al (Hardware)