the answer is: Last known good configuration
find out the boot key of your laptop or desktop normally it is F8. and press it when your PC is booting or starting. it will show your option to start in safe mode, last known good configuration, command prompt and more. Choose the option to start in last good known configuration, that it................
1) Last Known Good Configuration is saved each time a user logs on. or Registry settings collectively called the Last Known Good Configuration are saved in the registry each time the user successfully logs onto the system.
Configuration > Rescue
The Last Known Good Configuration is updated after you log on normally to Vista
If you have installed a new driver or application and Windows won't boot, try roll back driver first, but if that doesn't work then go to last known good configuration
Last Known Good Configuration (LKGC)
28 days
The last known good configuration is like windows restore, it will go back to the last installed software or last installed piece of hardware
You go to system restore in the backup center
Press the F8 key to access the advanced boot options
The Last Known Good Configuration feature is a recovery option that you can use to start your computer by using the most recent settings that worked. The Last Known Good Configuration feature restores registry information and driver settings that were in effect the last time the computer started successfully. Use the Last Known Good Configuration feature when you cannot start Windows XP after you make a change to your computer, or when you suspect that a change that you just made may cause a problem. For example, you can use this feature if you cannot start Windows XP after you install a new driver for your video adapter, or if you installed an incorrect driver and have not yet restarted your computer.When you start your computer by using the Last Known Good Configuration feature, Windows XP restores information in the following registry key: HKEY_LOCAL_MACHINE\System\CurrentControlSet Note Any changes that were made to other registry keys remain.