HDD not detected during fresh windows installation


May 25, 2011
So my brother decided to copy me and get a computer except for the fact that he had his built by cyberpower and i built my own. Anyways on the picking parts out part i decided for him not to get an os cause i had one sitting around i could just pop in and save a few hundred bucks. Well whenever i do this it goes through the stuff and when it shows the drives theres nothing there at all. I know there detected b/c when it first boots up it shows the trim raid with the 60gb ssd along with the 1tb hdd. idk if its the raid thats doing this or not but i have no idea what to do. Please help.