A way to undo system changes without affecting personal files
Enable System Protection in Windows 7
Before you install more programs and drivers on your newly installed Windows 7 PC, make sure that System Protection is enabled. System Protection is a feature that regularly creates and saves information about your computer's system files and registry.
System Protection also saves previous versions of files that you've changed. It stores these files in restore points, which are created just before important system events, such as the installation of a program or device driver. By default, System Protection is automatically turned on for the drive where Windows is installed. System Protection can only be turned on for drives formatted with the NTFS file system.
To check if protection is enabled, go to the Control Panel, click System, and choose System Protection.
