I have a 2008 IMac that boots into windows 7 Enterprise. I bought it used and don't know the password. I have tried so many things to reset the windows password but no luck, because it was linked to a domain and the both the Admin and the Administrator accounts are disabled. I went to restore it but, I get an error; saying "mountain lion is unavailable try again later", restoring from timemachine keep searching for backup for hours. I want to know if it is possible to format the hard drive and start from scratch? If so, can I put El Capitain and how do I get a copy and what are the steps to format the drive? I appreciate any help.