Yet another trojan
There is a trojan horse program making the rounds, currently under the name of deaztec1.6_final.exe. Do not download/open it if you wish to keep your QuakeNet username and password secure. If you have opened it you should change your Q password, uninstall mIRC, run a virus checker and then reinstall mIRC.
As always, only accept programs from people you know, and double check that they sent you the file, not an imposter or someone controlling their IRC client