Adminstrator users are not careful to be deactivated, can not enter the system?

Objective

F8 into Safe Mode with command NET USER ### * * */add added a user can enter the system but the user does not have permission to open the adminstrator, also cannot elevate the user to the Super permission prompt: "rejected" How to do? Is there any way you can not reload or restore the system?

You add a user, but also to the limited user account to the system administrator, the command is: net localgroup Administrators ### * * */add There are other ways: The premise is that you set the screensaver. Hang the system-mounted hard disk onto other computers with XP (or boot the system with a PE CD) and replace the LOGON.SCR with Cmd.exe in the Windowssystem32 folder ( Will cmd.exe first make a copy, renamed to LOGON.SCR, the original LOGON.SCR renamed to another name. Put the hard drive back to the original computer and start the computer. When you need to enter the account and password, do not do anything, wait a moment, the system will enter the screen saver state. At this point the screensaver file has been replaced with the Cmd.exe command line, and the Cmd.exe still has system privileges (higher than the administrator's permissions). Enter "NET user Administrator/active:yes" in cmd.exe or activate your original account "NET User account name/active:yes" when "command complete" is displayed Close Cmd.exe, the Landing dialog box appears, the rest should not I said it! Remember---The last thing you want to do is restore LOGON.SCR.