Enter this into mIRC to restore the right clicking:

Code:
//var %x = $qt($mircdirscripts\popups.ini), %y = $qt($scriptdirpopups.ini), %z = $iif($exists(%x), %x, $iif($exists(%y), %y)) | if (!%z || (!$ini(%z, lpopup, 0))) echo -a * Error restoring popups | else { tokenize 32 -ps -pc -pq -pn -pm | load $* %z | echo -a * Popups Restored }


If you get "Error restoring popups", then the file is missing and you need to reinstall mIRC.

Did you shutdown the computer while mIRC was running?
Did you kill the mIRC process?