New build wont detect HDD

[Aerozord]

ok so as most of you teck people know I built a new PC. Everything is running fine except for one thing. While I set up my SSD as my boot, and its functioning properly, windows (7 64bit) is not detecting my secondary HDD. So that means I dont have my mass storage. Which means I cant store games and media, the SSD is too small for that, until I get it working

The bios does recognize that its connected

I attempted to instal windows on it to see if that would help but it said it wasn't valid for some reason.

Motherboard is a msi: 760GM-p34 (FX)

To recap the motherboard detects it (not 100% if its enabled I am not used to this bios), but windows does not. I have installed all drivers. Will post any more informations as it comes up. Tried looking it up myself but most information I can find says this shouldn't happen because windows should auto-detect it.