Unfortunately Windows will not keep all restore points so you cannot go all the way back.
Do you have the original CD that came with the PC ?
Which Lenovo PC do you have ?
This may help: http://www.techiecorner.com/669/how-to-restore-to-factory-settings-in-lenovo-s10/
Wha problem are yoyu having ?
Are you sure you want to do a factory setting reset ?