People who use Symantec security products need to be particularly careful that they keep the product, and not just the pattern/signature files up to date.

http://www.snpx.com/cgi-bin/news55.c...91288405?-2622

It seems that there is at least one malware author who has "got it in" for Symantec (Norton) and is specifically targetting their products.

I would suggest that you should take this approach with all widely used applications that you have, as there has been an increase in application rather than operating system based exploits.