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STOP 0x0000007B INACCESSABLE_BOOT_DEVICE
http://www.vistaarticles.com/articles/252/1/STOP-0x0000007B-INACCESSABLE_BOOT_DEVICE
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Published on 12/10/2006
 
You receive the following error message.

STOP 0x0000007B INACCESSABLE_BOOT_DEVICE

This issue occurs if the AHCI driver (Msahci.sys) in Windows Vista is disabled. This driver must be enabled before you change the SATA mode of the boot drive.

1. Exit all Windows-based programs.
2. Click Start, type regedit in the Start Search box, and then press ENTER.
3. If you receive the User Account Control dialog box, click Continue.
4. Locate and then click the following registry subkey:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Msahci
5. In the right pane, right-click Start in the Name column, and then click Modify.
6. In the Value data box, type 0, and then click OK.
7. On the File menu, click Exit to close Registry Editor.