How do I restore my Dell back to an earlier checkpoint?

I have a Dell Inspiron E1405 and I need to reset it to settings at an earlier checkpoint time. Can someone tell me how to do this?How do I restore my Dell back to an earlier checkpoint?Start Button%26gt;programs%26gt;acessories%26gt;system tool%26gt;system restoreHow do I restore my Dell back to an earlier checkpoint?system restore, it comes on every dell computer