Downloader.misleadapp cannot be removed from an unsupported file

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I am running Norton Internet Security on a Windows XP laptop and get the following message five times when I run a full system scan:

 

 Downloader.misleadapp cannot be removed from an unsupported file

 

I also get the same message twice for anitvirus2009.

 

I have run through the steps outlined in the online virus removal page (disable windows restore, update virus definitions, run full scan in safe mode) but the messages persist.  I did not try the registry edit step as it appears that the first few steps need to be accomplished first.  Any suggestions on what to try next?

 

I have gone through the Norton online help and wasted several hours with the only suggestion being to pay them $99 for a "complete system diagnosis" and fix.   This seems like a very steep fee to accomplish what their software is supposed to do on its own.

 

Thanks for any suggestion!

 

- Robert Galejs