Hi, you can try following steps:
1, On logon interface, press Ctrl+Alt+Delete, type administrator, then press Enter. If this account need password, continue to step 2.
2, Reboot system, press F8 to run Safe mode with command line,
3, Click Administrator,
4, In Command Prompt window, type net user asd/add, press Enter,
5, Type net localgroup administrators asd/add
6, Reboot system, use asd account to logon system