Error on win 7 install on iMac with 2 drives

OK been round this a few times.

iMac (i7)

1Tb HD & 256 SSD

used bootcamp to partition

made it through win install

and clikced Bootcamp partition, then advanced, then format.

Finishes format and the I click

NEXT

error

Windows is unable to install to the selected location.

Error: 0x80300024

Which someone online said is due to having more tha one drive.

********.

I dont really want to crack open the iMac and remove a drive.

Suggestions?

thanks

b