There are so many different trojans, each having different effects on your puter.
-Check out the info at
http://www.mirc.co.uk/help/virus.html- I would try one of the free online scanners like at
www.trendmicro.com as they can be better at detecting and cleaning IRC type trojans. Make a note of whatever is found, and do some research on their website to see what other action you may need to take. Some of these trojans insert registry keys, and may add files to windows\system so simply deleting a couple files isnt going to resolve the problem
