Quakenet offers unbelievable kill messages, that dont help you whateverso, so..

For Virus/Trojan removal help, see this link.

99% of the time you are banned with that message, simply because your Identd(or realname) fields have been changed by a trojan, perhaps even manually (settings can be changed via, ALT + O options) and the network thinks your infected, and even AFTER removal of the trojan these fields will still exist until they are changed manually by you, or mIRC is reinstalled.

Eamonn.