http://support.microsoft.com/kb/922976

This issue occurs if the disk driver in Windows 7 or Windows Vista is disabled. This driver must be enabled before you change the SATA/RAID mode of the boot drive.

To Fix,

1.  Change BIOS back to IDE mode so windows can start up.

2.  Run the fix it from the support link.

3.  Change the BIOS back to SATA or RAID mode after changes and restart the computer


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