I need to install the Boson's exam engine which is provide with CCNA Official exam Certification Guide. I tried to install it but I didn't success. I met this problem "Error 1609. An error occured while applying security settings. Users is not a valid user or group. This could be a problem with the package ..."
I reinstall my Windows XP, but I still have the same problem.
Any idea !!! How can i resolve this problem !!! Thanks for your help.