When you restore previous versions you can copy the

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When you restore previous versions, you can copy the previous version to a new location, or restore it to the same location (overwriting the existing version). Previous Versions works only on NTFS partitions. Windows 7 System Recovery 0:00-0:14 In this lesson, we'll discuss the system recovery options on Windows 7 systems. System recovery is the process of recovering the operating system from a serious problem that prevents the computer from starting. Last Know Good (LKG) 0:15-2:05 If Windows 7 won't boot and you can't log on, a good starting point for system recovery is to load the last known good or LKG configuration. To do this, press F8 during the boot process, right after post and before Windows starts to load to access the advanced boot options menu. Then, select the last known good configuration advanced option. When you boot Windows and then successfully log on, a copy of the current Windows configuration,the LKG, is automatically saved on your computer. The LKG includes only the configuration that exists immediately after log on. If you were to install a new device and its associated driver after logging on,the new driver would not be included in the LKG.
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This can be useful in situations where that new driver is actually causing the problem that is preventing Windows from booting properly. As long as the change that's causing the problemoccurred after the last successful log on, you can select LKG from the advanced boot options menu.When you do, the configuration that was saved immediately after the last log on is restored and used to boot Windows. Many times this will fix the issue that's preventing the system from booting. However, the LKG option will not work if you successfully logged on again after making a change that is now causing the system to not boot. For example, suppose you were to boot the computer, log on,make a driver change, reboot the system and then successfully log on before the problem manifests itself. In this situation, the LKG will contain the changes that are causing the problem. Remember, every time a user logs on, a new LKG configuration is automatically saved. Therefore, if you are able to log on after making a problematic change, that change will be incorporated within the LKG configuration. Selecting LKG from the advanced boot options menu won't solve the problem in this scenario. Safe Mode 2:06-2:36 If this is the case, another recovery option to try is booting the system into safe mode. When you boot Windows into safe mode, only a minimal set of applications and services are loaded. Just enough to get the system up and running. If the system is not bootable normally because of a bad driver, then safe mode will prevent that driver from being loaded. Once in safe mode, you can try to recover the system by performing actions such as making configuration changes, removing buggy drivers, uninstalling applications and reverting the system to a previous restore point.
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