Sysstem Restore (if that's what you're referring to) is a very mixed blessing. It uses a huge amount of disk space, and contrary to what you think when you turn it off, keeps all the old files in a folder called 'System Volume Information'. I found that this file had grown unannounced to 40Gb. My solution was to delete all the early files and restore points and just keep the recent ones. The other programme I use, which I find infinitely more efficient, is a registry utility called Resplendent Registrar. This allows you to copy your registry with a snapshot, and thus is infinitely faster and more precise IMHO than System Restore. This is shareware for about $40, but has been more than worth it for the recovery it has allowed so far. It also allows a registry search and editing facility and easy access to System Volume Information. Just my experience.
Have gotten the impression that Windows Restore can not always be relied on to do what it is supposed to do. What are the best replacements for it (''purchase'' software; shareware; and/freeware)?