Hi there,
When you installed your OS did you set IDE, AHCI or RAID in BIOS?
Have you tried setting IDE drives as one to Master and one to Slave?
What revision is your motherboard? (you can find this number on the Motherboard box or printed on the bottom left hand corner of the Mobo)
Which Version of Windows 7 are you running (Home, Pro, Ultimate) and is it 32 or 64 bit version?