You must have had a previous abortive attempt to install!
Although the built-in BCDEdit can manage the booting, I suggest you download EasyBCD, scroll down to the bottom here
http://neosmart.net/dl.php?id=1 and get the instructions here
http://neosmart.net/wiki/display/EBC...mentation+Home
After you have installed it, go to the Add/Remove Entries Tab to remove the ‘rogue’ entry.
At some later date you may want to remove the failed installation.