Where are u getting the files you need to check the MD5 checksum on them or oyu can get th efiles from here and they are clean Mirc 6.13 and Invision 2.0 B3515
http://www.ircmadeasy.com/Files/Invision.rar
Also if you do a general search of this forum you can find more answers to your Virii problem,
Just a note all files hosted on My Site
http://www.ircmadeasy.com and on cRYOa site
http://invision.lebyte.com are 100% clean to ne virus definitions on Macafee, Norton, and TrendMicros online scann