mIRC is very basic from a original install, it is also pretty secure.

Warning messages regarding receiving files from other users, are displayed every time, until they disable the message.

Only the requirment of basic settings when you first open mIRC (though a small popup the very very first time, saying only this screen needs changing to get mIRC operational would help users).

Why stirp mIRC down to basics, when basic is what you get anyhow.

Users would only need to download a new version when they want to go advanced. When they do this, they would still be a noob (excuse the expression) to the world of remotes and scripts. If fact, they would be more likely to be infected, as they havn't started with a cautious attitude from the start.