There is probably an issue with a prior system boot partition. Use the following guide to do a CLEAN install. Be sure when you get to the point where is asks where you want to install windows, that you delete ALL of the existing partitions on that drive unless there are separate partitions with data you wish to keep in which case I'd back it up someplace else and then delete all the partitions.
When you get to that window, click advanced, delete the partitions on THAT drive only. In fact, it's a good idea to disconnect any other drives while installing. Then install to the unallocated space. Windows will automatically perform an formatting and create any necessary partitions.
http://www.eightforums.com/tutorials/2299-clean-install-windows-8-a.html