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If you choose Windows Vista or Windows 7, Windows Boot Manager starts the Windows Boot Loader to open Windows . If you choose Earlier Version Of Windows or another entry for Windows Server 2003, Windows XP Professional, Microsoft Windows 2000, or Microsoft Windows NT 4 .0, Windows Boot Manager starts Ntldr, which then proceeds with the hardware detection phase . If you select another operating system, control is passed to the boot sector for the other operating system . If you choose Windows Memory Diagnostic by pressing the Tab key, Windows Boot Manager starts the diagnostic tool without first opening Windows .

Determining if a File Exists Using FileDialog Previously in this chapter, you saw how to determine if a file existed using the FileSearch object. Now that you have reviewed the FileDialog object, review the following function. The same results are returned, but a different method is used to achieve the same results. The function will return True if the file exists and False if it isn t found.

The Windows Boot Manager starts the Windows Boot Loader phase when the user chooses to load Windows Vista or Windows 7 . The Windows Boot Loader does the following:

1. 2. 3. 4.

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Loads the operating system kernel, Ntoskrnl .exe, but does not yet run it . Loads the Hardware Abstraction Layer (HAL), Hal .dll . This will not be used until the kernel is run . Loads the system registry hive (System32\Config\System) into memory . Scans the HKEY_LOCAL_MACHINE\SYSTEM\Services key for device drivers and loads all drivers that are configured for the boot class into memory . The Windows Boot Loader does not, however, initiate the drivers . Drivers are not initiated until the kernel loading phase . Enables paging . Passes control to the operating system kernel, which starts the next phase .

Function FileExists2(fname) As Boolean Set FileSys = CreateObject( Scripting.FileSystemObject ) FileExists2 = FileSys.FileExists(fname) End Function

5. 6.

The Windows Boot Loader is responsible for loading the Windows kernel (Ntoskrnl .exe) and the HAL into memory . Together, the kernel and the HAL initialize a group of software features that are called the Windows executive. The Windows executive processes the configuration information stored in the registry in HKLM\SYSTEM\CurrentControlSet and starts services and drivers . The following sections provide more detail about the kernel loading phase .

The function created an instance of the FileSystemObject object. The FileSystemObject gives you access to the computer s file system. Once access is granted to the computer s file system, the function uses the FileExists property of the FileSys object to determine if the file exists. The code is much simpler and more elegant than the earlier example.

The Windows Boot Loader reads control set information from the registry key HKEY_LOCAL_MACHINE\SYSTEM, which is stored in the file %SystemRoot%\System32 \Config\System, so that the kernel can determine which device drivers need to be loaded during startup . Typically, several control sets exist, with the actual number depending on how often system configuration settings change .

The HKEY_LOCAL_MACHINE\SYSTEM subkeys used during startup are:

\CurrentControlSet, a pointer to a ControlSetxxx subkey (where xxx represents a control set number, such as 001) designated in the \Select\Current value . \Select, which contains the following entries:

VBA contains a number of statements that allow file manipulation. These Input/Output statements give you more control over files than Excel s normal text file import and export options. The standard procedure for writing to a text file is listed here:

Default Points to the control set number (for example, 001=ControlSet001) that the system has specified for use at the next startup . If no error or manual invocation of the LastKnownGood startup option occurs, this control set number is designated as the value of the Default, Current, and LastKnownGood entries (assuming that a user is able to log on successfully) . Current Points to the last control set that was used to start the system . Failed Points to a control set that did not start Windows Vista successfully . This value is updated when the LastKnownGood option is used to start the system . lastKnowngood Points to the control set that was used during the last user session . When a user logs on, the LastKnownGood control set is updated with configuration information from the previous user session .

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