you can get access to your admin account in any windows system but you have to bypass the system by making pen-drive boot-able which help you to start your system in windows installing mode and need to go command prompt(cmd) and if you could rename your cmd.exe to utilman.exe than you will be able to open cmd in left corner of login windows password and from there you can type comptmgmt.msc and go to local user and groups and in subheading click in users from there select the user account and right click on it and click on set password and you will be able to change your password or you can leave it blank.