System Restore helps you restore your computer's system files to an earlier point in time. It's a way to undo system changes to your computer without affecting your personal files, such as e‑mail, documents, or photos.


Please make sure that System Restore is turned on after use, otherwise you cannot restore your system to an earlier point in time when system restore is required in future ..



1. Go to Control panel (Classic View), double click on System
or Right click My Computer/Computer and then click Properties.


In Control Panel Home ...










2. Go to System Protection and remove tick marks from selected drives in "Automatic Restore points".









Are you sure you want to turn System Restore off?
In Widows Vista when you disable/turn off System Restore it will delete all existing Restore points.



Now System restore is turned off ..

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Related:
How to turn off System Restore in Windows XP ?