You need to build your RAID array before you install windows. Also, you have to hit a special key to get into the RAID configuration, I think it's something like shift+F2 when it's first booting up (don't quote me on that).
Edit: Oh yeah, which type of RAID are you trying to set up? 0, 1, 5?
Sorry I didn't read the whole thing. I am trying to do a RAID 1 mirrow also I forgot to tell you my specs. I have an Intel DX79SR mobo, i&-3930K, 64GB RAM, 5 each 1TB WD Black, all in a Thermaltake Level 10 with a 1275 watt PS.
May I ask why you are going with RAID1 instead of RAID5? RAID1 is usually used with 2 drives, 3 in extreme cases. 5 drives would fit a RAID5 better. That way you get redundancy without losing as much space. If redundancy is crucial you have enough drives to do a RAID6.