I have a problem with a laptop that is in an old domain. I need to uninstall some of the programs on that machine. For that, it is asking for the administrator password. The old domain’s administrator account password is not accepted and there is no other local administrator account configured on that machine. How can I log into that machine and join it to the new domain?
If you can gain access to the hard disk (e.g. by connecting it to another system or by booting from a repair disk) it is rather easy to hack into your system.
This article explains how. http://carnal0wnage.attackresearch.com/2012/04/privilege-escalation-via-sticky-keys.html
Once you have a command prompt you can reset the administrator password by using this command:
net user administrator <password>