Change user priviledges to administrator

After a lot of attempts i have worked out how to sort out the problem of user being reverted to standard as opposed to administrator.
Boot from the CD. Do not do a reinstall.
In the drop down menu utilities choose reset password.
Choose the System Administrator and reset the password. NB This password must NOT be more that 7 letters long otherwise it won't recognise it when you try to log in.
Shut down and restart computer.
At login either choose system administrator if you have a pulldown menu otherwise type in root as the user name and then the new password.
Go to accounts in the system preferences and click the box against your name to give administration rights on the computer.
log out as SA and log back in as yourself.

Hope this stops some people getting as frustrated and angry as i have.