Example analysis of the powerful features of XP "last-time correct configuration"

Even the old users of XP system may not know much about the "last correct configuration" function, and may never even hear about it. Over. If you make changes to your system that prevent you from starting, or if you want to undo your previous changes, you can use this feature, which will start your computer with the most recent valid settings. Now let's take a look at the details of its powerful features.

 The last time the correct configuration " function principle:

Windows startup process may use three control groups: ControlSet001, ControlSet002 and CurrentControlSet, they all have the same child structure . Normally boot the computer using the settings in CurrentControlSet. If the startup is successful once, it copies the data in CurrentControlSet and ControlSet001 into ControlSet002. During system operation, if a new driver is installed or the configuration is changed, the changes are written to CurrentControlSet and ControlSet001. If there is a problem at the next startup, select “last configuration correctly> will command WindowsXP to use the data in ControlSet002, which represents the state of the system when it was last started correctly.

An extreme situation:

If you have "correctly configured last time" and made configuration changes again, the new changes still fail because WINXP has stabilized and normal. The working control group (formerly called "last successful startup" rolled back one level and lost the correct configuration, what should I do? Don't worry, Windows XP has already taken into account, when using “ the last time correctly configured & rdquo When booting the system, WINXP will create a new control group sub-item ControlSet003, in case it has to be used again.

Note: Any changes made to other registry keys cannot be restored. For example, after installing SP1, you cannot use the "last configured correctly" function to undo the installation of Windows XP SP1.

Description of use case:

A user downloaded the latest printer driver and installed it. When the computer is restarted in the afternoon, the prompt “STOP.IRQL_NOT_LESS_OR_EQUAL” appears and cannot be booted to the desktop. This situation is generally caused by driver incompatibility, use "ld of the last correct configuration", restart the computer, and immediately appeared the familiar XP desktop.

After the principle of "correct configuration of the last time", to the general extremes to use, and then to the analysis of the examples, I believe that everyone has a preliminary understanding of "the last correct configuration" If you want to make better use of this feature, you may wish to operate it according to the specific situation.