Since this is a new system, I assume you are using a SATA drive. If so check your BIOS setting, should be AHCI (unless you are planning a raid setup).
Try selecting custom install. When you get to the screen that ask where to install. Remove all partitions and (your choice - create multiple particians ie for a C and a D drive, or partition the whole drive ( C only). select the partition you wish to install windows on. It will probably add a vey small partition (ie 100 Megs) DO NOT try to install on this partition.