Windows Vista's System Restore feature is designed to give you the option of rolling back (restoring) your system to the exact, same state as it was at a particular point in time in the past. It regularly analyzes your system and sets up system snapshots or “restore points” that you can rollback your system back to.
You can reclaim precious disk space by deleting old system restore points and back up files, as well as shadow copies of program installation files. If you do not need this service, disabling it will free up system resources and speed up performance. Read on to learn how.