Just a general tip: being polite will always get you more answers than just a demand. Please remember that the people here are unpaid volunteers and enthusiasts.
To answer your question:
a large number of viruses and trojans now use mIRC for one reason or another; if you never downloaded the program then you have probably been infected.
I suggest that you run an up-to-date antivirus program and an up-to-date anti-trojan program (like PestPatrol from
SaferSite) to try to get rid of the problem. Search for mIRC files on all your hard drives, and remove mIRC from your registry.
PM