Not to worry
I guess that _was_ a little nerdy...sorry!
Just alert the person that they passed along a virus and suggest they disinfect their system.
If your friend doesn't know what to do about the virus (and very likely does not have safeguards in place or would not have passed a virus) the Roadrunner web page (Roadrunner is their internet service provider as indicated by the ".rr.com" in the email address you cited) might point them to resources and information to get them started.
I use Macintosh, which is practically immune to viruses, or I'd be more specific about what to tell your friend. Norton's is good, but there are lots of others , some possibly free, and there are many steps you can take to keep your system healthy that are good to be aware of.
Don't worry about touching the offending email again because Norton will have killed off the virus. You can reply to it to tell your friend without fear!
Hope this helps!