Did this just magically start happening or were you doing something before? Did you update any firmware? Change a partition size? Change hardware? Do you dual-boot? Any reason your MBR might have been messed with?
The Windows 7 CD should have a "Repair Windows Option". You can also make a Windows 7 Repair Disc right from Windows 7. This will provide tools to restore your MBR, etc.
In your BIOS, why is your SATA configured as IDE?
Try switching SATA cables and SATA ports on your motherboard.
All else fails, dig into your mobo manual and figure out how to reset your CMOS. Normally you move a jumper or remove the battery for a minute or two.
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