Trojan.Dropper?

I'm back. I don't know if this is new or residual from my last problem:
http://forums.majorgeeks.com/showthread.php?t=61266

I haven't really noticed anthing until Norton's Antivirus found Trojan.Dropper but said "Repair Failed".

I started doing every I could think of and eventually came back here.

I've read the "DO NOT POST UNTIL YOU HAVE READ THIS: How to: Spyware, Trojan And Virus Removal" post and done everything there, including the safemode instructions.

Trend Micro's Free Online Virus Scan found EXPL_IFRAMEBO.A but said it couldn't fix it.

I've attached my HJT file after the last step and hope someone knows what's going on.

 

I did run CCleaner in safe mode.

I ran Nortons again to get the information. It's "The compressed file stdio.dll within C:\Program Files\mIRC\nnscript373.exe is infected with the Trojan.Dropper virus." I don't know mIRC well enough to know what this is/does/or when it got there. It looks like it was installed in the original installation. Is there a way to clean this file? What happens to mIRC if I just delete it?

 

I deleted it and mIRC still works (at least for what I use it for) so I'll just leave the file in the Recycle Bin while I try to find out from either Symantec or mIRC people if they know anything.

Thanks for your help ,-)