Under no circumstances select the optimized option as it can make the MB unstable.
What I would suggest now is that you at least try and get the OS installed with the set up that you have running at present, we can come back to the troubleshooting later, see below;
Please refer to your user manual for how exactly you should set up your MB, I have however provided you with the basics below
To change Boot Sequence in your BIOS
Reboot the system and at the first post screen (where it is counting up memory) start tapping the appropriate button that allows you to access the BIOS (Del – F8 etc)
This will enter you into the BIOS/CMOS
Find the Advanced area and click Enter
Look for Boot Sequence or Boot Options and highlight that click Enter
Now highlight the first drive and follow the directions on the bottom of the screen on how to modify it and change it to DVD/ CD drive
Change the second drive to the C or Main Drive
Once that is done then click F10 to Save and Exit
You will prompted to enter Y to verify Save and Exit.
Click Y and the system will now reboot with the new settings.
While you are in the BIOS you will also need to reset the time and date and again save the new settings (F10) and then Y to accept the changes.