Hmmm, I seem to have some sort of security problem with the suggested solution. When I boot from the system repair disk and bring up the command window, I cannot access the files or directories in the drive with Windows. The message is "Volume in disk c is System Reserve". PS: I finally used iSeePassword windows password recovery software to reset my windows 8 password, it works fine. [URL] there are also some other freeware like ntpasswrod, ophcrack and more...
After forgot admin password on Windows 8, how to access dell computer?If just in order to login Windows 8, there are several ways available. Why? Because remove, reset, recover or bypass Windows 8 password can work. The good third-party Windows password recovery tool is the most easiest and fastest way, such as Windows Password Genius advanced. The effective tool can be used to remove password for Windows 8/7/Vista etc and reset password for Windows server. So remove admin password with it could save time and guarantee result. The advanced version is special for Windows 8 with high affection. Modify registry can bypass admin password to access computer. 1. Click “Win + R” to open “Run” dialog, input “regedit” command and click “OK” to enter registry setting surface of Windows 82. Modify HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\Current Version\WinlogonRight-click and create a new string value, rename value name as AutoAdminlogon3. Find DefaultUserName, set it as the default user name to sign in Windows. And create string value DefaultPassword, set the value as the password of the default Windows login user. Reset disk is the most appropriate utility for Windows 8 admin password recovery. It is usually created before you forgot admin password. So on logon screen, when you type wrong password, a message will prompt you clicking “Reset Password” link to go on Windows password reset. 
How to Login Windows 8 after Forgot Admin Password?