Is this the main drive you are trying to install Windows on?
if so, here is how you reset a drive (all data on the drive will be lost). If there is data on the drive you need, you will have to back it up first.
At the screen where you choose the drive to install Windows on do the following
SHIFT+F10
type Diskpart
list disk
select disk X (X being the drive you like to install Windows on)
clean (this will reset your drive, and all data will be lost)
exit
exit
click the Refresh button
click on the drive and click the Next button
if so, here is how you reset a drive (all data on the drive will be lost). If there is data on the drive you need, you will have to back it up first.
At the screen where you choose the drive to install Windows on do the following
SHIFT+F10
type Diskpart
list disk
select disk X (X being the drive you like to install Windows on)
clean (this will reset your drive, and all data will be lost)
exit
exit
click the Refresh button
click on the drive and click the Next button