Ok Seems like all that fixed the problem. I found an adware program from lavasoft that was corrupted, I deleted that and installed a fresh copy. Then I deleted the the hijacker programs i had from that progam and restarted mirc. I then deleted the trojans and uninstalled mirc. I then installed a new dloaded copy of that. Now i dont seem to be getting any hijackers or trojans. Basically, i think symantec was saying that the backdoor.flood was included in the mirc program, which is what I suspected. I have talked to many users of mirc and they all say that the trojans are a result of programs improperly identifying them. In this case I think they are wrong and I would suggest that they take care of that problem.
Thanks for all your help.