Only since I installed three version of this so called Chat app in my many different OSs, I can tell you it is the most dangerous and trouble inviting thing - bar older varions of Net Meeting ICQ etc - you could install.

There are alternative ways to go, Java for example which you can turn off.

It appears that installed mIRC in particular is open ports on your machine once you have ran it. IOW Its open season for hackers even the kiddie type, and childsplay literaly to shutins who always seem to have stashs of code on some webpage or other somewhere on the net.

Do yourself and the rest of the netizens a favor, don't install any of these hacker's nodes!