If you are sure that your computer is in good shape you can delete all but the current restore points by:
goto start|accessories|system tools|disk cleanuo|more options|system restore and select clean up.
When you say that nothing happened and I know that this is an odd question, but could you be more specific?
When you clicked it did you see it scanning?
Im a little confused in that your 4th post seems to indicate that you got it to work.
My computer is only set up with one user, but from what I see in the video and if you have more than one user you may need to select all users to get the more options tab.
In Jenae's link she is showing you how to limit the size that the restore points can use on your HDD.
Depending on the size of your HDD Windows may allow them to reach 45Gigs or so.
By doing what she suggests you will be limiting it to 4G, Which is an adequete amount.
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