hey folks, i need some help!

i just assembled a new comp for my mother and i cannot get win 7 to recognize seagate hard drive.

i ran a seagate dos test and it is functioning properly, the mother board recognizes the HDD.

but when i try to load w7 64 home it will not, tell me i need to load drivers for the hard drive

mother board is a gigabyteGA-MA74GM-S2 REV 4.4
hard drive is a Seagate barracuda 7200.12 3.0 sata
gskill ram.

any advice would be greatly appreciated!!!!!!!!!!!!