Install Linux. Ok, just kidding. What exactly are you trying to do? I don't know if I can be much help, I still get to send DCC files. But I can always try. Are you just trying to hide your information?
What about setting up a firewall while you use mIRC? Just block all the ports but the ones you need. I'ved used mIRC for a long time. I have never had anyone hack into my computer yet. (knocks on wood). I guess it would depend on where you go though.
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Ok, just kidding. What exactly are you trying to do? I don't know if I can be much help, I still get to send DCC files. 
