Is that a second drive? If so the first installation was detected on the older drive and the entry for that was added into the boot.ini file found at the root of the hard drive.
NotePad can easily be used to remove the second entry once you uncheck the hide protected system files option in the tools>folder option>view section. If the first drive was an ide model while the new one is a sata the boot information went on the ide drive even if Windows was installed to the new drive.
On a new drive with no second drive installed the reference to a second copy of Windows wouldn't be seen since the new drive lacked any previous installation. If there is a first ide drive you would have to unplug that and then boot upto the recovery console for rewritting the mbr with the "Fixboot" and "Fixmbr" commands at the command prompt seen there. Then you simply set the new drive as the default boot device in the bios.
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