Vista automatically makes a restore point when you install software and updates provided that System Restore is enabled. You can also manually create points at any time. If System Restore has been disabled, either intentionally or by a virus or malware, then you end up not having any restore points to select. I have just checked my System Restore and have eleven points during the last eight days. I know that information does you no good at this time but when you clean the machine of it's nasties then you know that, provided you enable it, System Restore will be doing it's job.