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process; symptoms include warning messages, startup failures, and Stop messages . The causes are typically improper device configuration, incorrect driver settings, or hardware malfunction and failure . For detailed information about troubleshooting hardware problems, read 30 .

This statement will release the reference to the object and set the object variable to its unini tialized state. Assuming that there was only one object variable that pointed to the object, this statement will also destroy the object and release all the resources associated with it. However, if multiple object variables point to this object, all of them must be set to Nothing before the object is destroyed. For example, in the following code fragment, the object created from MyClass continues to exist, even though ObjectVariable1 was set to Nothing.

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Windows automatically captures system state before installing new applications or drivers . You can later use the System Restore tool to return to this system if you experience problems . To start System Restore from within Windows (including safe mode), click Start, click All Programs, click Accessories, click System Tools, and then click System Restore . To start System Restore when you cannot open Windows, follow these steps:

1. 2.

Set ObjectVariable1 = New MyClass Set ObjectVariable2 = ObjectVariable1 Set ObjectVariable1 = Nothing

Start System Recovery tools, as described in the section titled How to Start the System Recovery Tools earlier in this chapter . Click System Restore .

The System Restore Wizard appears . Follow these steps to restore Windows to an earlier state:

1. 2.

It s important to keep in mind that an object is not the same thing as an object variable. For example, the following code creates an object, which has two variables pointing to it:

On the Restore System Files And Settings page of the System Restore Wizard, click Next . On the Choose A Restore Point page, click a restore point . Typically, you should choose the most recent restore point when the computer functioned correctly . If the computer has not functioned correctly for more than five days, select the Show More Restore Points check box (as shown in Figure 29-7) and then select a restore point . Click Next .

3. 4. 5.

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On the Confirm Disks To Restore page, click Next . On the Confirm Your Restore Point page, click Finish . Click Yes to confirm the system restore . System Restore modifies system files and settings to return Windows to the state it was in at the time the restore point was captured . When System Restore is done, click Restart . You should now attempt to start the computer and identify whether the problem was resolved . When the computer restarts, Windows will display a System Restore notification . Click Close .

6. 7.

Startup Repair is by far the quickest and easiest way to solve most startup problems . However, if you are familiar with troubleshooting startup problems and simply need to fix a boot sector problem after installing another operating system, you can run the following command from a command prompt (including the Command Prompt tool in the System Recovery tools) .

The first Set statement creates a new instance of MyClass, whereas the second Set statement merely creates a second pointer to the same object created by the first statement. This means that the following statements will do the same thing because both ObjectA and ObjectB point to the same object:

Bootsect .exe is available from the \Boot\ folder of the Windows DVD and can be run from within WinRE or Windows 7 . After running Bootsect, you should be able to load Windows, but you may not be able to load earlier versions of Windows that are installed on the same computer . To load other operating systems, add entries to the BCD registry file, as described in the section titled How to Create an Entry for Another Operating System earlier in this chapter .

The simplest way to solve problems related to the BCD registry file is to run Startup Repair, as described earlier in this chapter . However, you can also use the System Recovery tools to update the BCD registry file manually by following these steps:

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