Restoring a lenovo laptop with windows 7 to factory settings

[alcemorgan8]

I want to restore my lenovo laptop with windows 7 back to the factory settings. How do I do this quickly and effectivley?

 

[dodger46]

What model? Does it have a 'One Key Restore' button?
http://prntscr.com/cjh5z
If so, details here
http://consumerdl.lenovo.com.cn/UserFiles/UserGuide/en/User%27s%20guides%20and%20manuals/G450-G550/Lenovo%20G450-G550%20User%20Guide%20V1.0.pdf