I find lots of things about dual booting but nothing on anti dual booting so i've decided to come here.
i recently installed vista while with my windows xp hdd was plugged in (big mistake). I only wanted my other hdd in so i could copy the files to my new hdd then get rid of it so i can finally use my dvd drive. the problem now is if i remove my windows xp drive then try to boot up it says something like insert bootable media and press any key to continue.
You can do a repair of Vista using the Vista hard drive. The boot-loader is on your XP drive, so that's why you can't boot without it. Performing a repair install on the other drive should put the boot-loader on it and enable you to boot from that drive.
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