1 use bootable usb to start pc
2. choose troubleshooting menu
3. click command prompt
4. type command diskpart
5 . type list volume and find you USB bootable volume
6. go to d:(USB volume example)
7. go to c:\windows\system32
8 tape copy cmd.exe cmd1.exe
9. type copy Utilman.exe Utilman1.exe
10 rename cmd1.exe Utilman.exe
11 restart computer (take out usb)
12 clikck left button first icon
13 type net user
14 type net user administrator *
15 add new password for user
it finish