go to : storage > disk management
you will see 3 thing :
1- Disk 0 basic
2- Disk 1 basic : 1.00 GB Healthy (Primary Partition) || 467.76 GB health(Primary Partition)
3- CD-ROM
now go where it say Disk 1 basic ,right click { 467.76 GB health(Primary Partition)} than click delete volume
a warning message appear;
the selected partition was not created by windows and might contain data recognized by other operation system.
do you want to delete this partition ?
click yes
now it change the name from primary partition to Unallocated
right click to unallocated click : new simple volume click next >than next > than next > than finish > wait formatting .
unplug you hard drive and try it >than have nice day