i want to retrieeve my administrative password

[renike]

Good day pals,
                       Please i lost my administrative password,this was done due to my mistakenly deleting 
one of the parental user which i set up,and it happened to be the one with the administrative password.whenever i try to download a request for administrative password pops up with only the ''no'' being accessible.please how do i go about this challenge?If eventually the solution is to format,how do i go about that too?.                                                 

[Allan]

https://www.google.com/search?hl=&q=disable+bho+ie&sourceid=navclient-ff&rlz=1B3GGLL_en-GBUS430US394&ie=UTF-8#hl=en&rlz=1B3GGLL_en-GBUS430US394&sclient=psy-ab&q=lost+admin+password+windows+7&oq=lost+admin&gs_l=serp.1.0.0l4.1400102.1401622.1.1403608.10.8.0.2.2.0.236.957.2j5j1.8.0.les%3B..0.0...1c.1.Stzm75_WzVw&pbx=1&bav=on.2,or.r_gc.r_pw.r_qf.&fp=7d6f864ad125e204&bpcl=35466521&biw=1280&bih=633