Restore Point

Types of restore points are as follows:

• System checkpoints: Scheduled by the OS
• Manual restore points: Created by the user
• Installation restore points: Created upon installation of certain programs

Some OSs set automatic restore points, depending on a computer's purpose and assigned rules. For example, Windows XP creates restore points during the installation of all unsigned/unauthorized device drivers or compatible system restore applications. However, two OSs by the same manufacturer often have major differences. An example is MS Windows XP and MS Windows Vista.

Windows system restore has limitations and complications, as follows:

• Does not always fully restore software installations and upgrades, due to Windows OS incompatibility and other issues.
• Some third-party applications, such as Norton's GoBack and Horizon DataSys's Rollback Rx, provide more complete system restore execution.
• May fail to create restore points when free hard drive space is limited.
• Under certain circumstances, viruses may be restored. Disabling system restore to eliminate viruses may result in losing all saved restore points. As an alternative, a user should wait until scheduled restore point operations are executed and viruses are eliminated.

Restore points are not permanent because the RPLifeInterval registry setting eventually deletes all restore points at predetermined intervals. With dual-boot systems, not all OS changes are monitored, resulting in incomplete system restore execution.