Your old settings will work, but the scripts you have installed will not. Some of them might, but clearly one of your scripts is broken.
The mirc.ini file contains both your settings and the information about which scripts are loaded, but one of the scripts is causing mIRC to freeze. You can load up mirc.ini and go to the [rfiles] section. Removing one of those lines at a time and restarting mIRC will show you which of those scripts is the problem. Make sure mIRC is not running when you edit mirc.ini. And make sure you backup your files just in case.
