eSATA PCIe card stopped working

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I recently installed a pcie esata card to my quad core dell running Vista home premium. I had a WD mybook home connected via esata. It worked immediately after install. It worked for a week or two and now if I reboot and the card is in I get an error message: AHCI bios is not installed..this appears right after Dell splash screen. cannot enter bios from splash screen. If I remove the card windows boots normally.

I really enjoyed my esata external drive..
any ideas how to fix?
 
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