Error Message During Windows Vista Boot Up Process

The Advanced Host Controller Interface (AHCI) is a mode that defines the operation of Serial ATA host-controllers and offers a typical method to configure, program and detect SATA adapters. An error message might occur when you change the mode of the Serial Advanced Technology Attachment (SATA) to AHCI mode.

As a recent scenario with Vista, when a user changes the SATA mode of the boot drive in the BIOS setup to use the AHCI specification he receives the following error message when the computer restarts:

TOP 0x0000007B INACCESSABLEBOOTDEVICE?br />
Cause

The main reason for the above problem is that AHCI driver (Msahci.sys) in Windows Vista is disabled. The user needs to enable the AHCI driver before changing the SATA mode of the boot drive.

Resolution

To resolve the above issue, the user needs to make changes in the registry. The user needs to enable the AHCI driver in the registry before changing the SATA mode of the boot drive. This can be done Windows 7 Product Key with the help of these steps:
1.Firstly the user needs to exit all Windows-based programs.

2.The user needs to click Start, type regedit in Run or Start Search window, and then press ENTER.

3.If the user receives the User Account Control dialog box, he needs to click Continue.

4.The user needs to locate and then click the following registry subkey:
HKEYLOCALMACHINE\System\CurrentControlSet\Services\Msahci

5.In the right pane, the user needs to right-click Start www.twitter.com in the Name column, and then click Modify. In the Value data box, type 0, and then click OK.

Microsoft Office 2010 Product Key 6.The user needs to click on the File www.hotmail.com menu to close Registry Editor.

The Windows 7 Professional Key user might receive the same error message intermittently especially those with more than one hard drives. In such circumstances, the user needs to do a clean reinstall that will lead to data loss without proper backup already taken. To recover the lost data, the user can restore all the data through the recent back up. In case, if the user has not maintained any back up the user needs to use a third party application to recover the lost data. Such third party applications are known as Data Recovery Software.

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