How to restore my dell inspiron back to factory specs without recovery disk?

I have a dell inspiron B130 computer that needs to be restored to the original settings. I don"t have the recovery disk??????????How to restore my dell inspiron back to factory specs without recovery disk?Most newer computers have the recovery on a partition in the HDDHow to restore my dell inspiron back to factory specs without recovery disk?F11 at the start up (when the dell logo is shown) good luck