I once had a similar issue. Move the HDDs to SATA ports 0 and 1 (some can be labelled A0 and A1) on the motherboard if not already. If they are in A0 and A1 I think this will help.

edit: I forgot you had 2 HDDs and an optical drive which I assume is also sata controlled... easy answer would be to make a bootable usb from your windows disk. Apart from that, try to avoid any A0 or A1 but go for A0 if it's your only option. I'm don't recall why but sometimes they can be redundant depending on set up. I can't seem to google good information on your board or the controllers so it's a bit of a stab in the dark :(