Hello grandma....
not sure what to say,,,I take it you don't have the clean sweep on your norton then.....???? bring up the system works....then utilities ...then system maintaince.....then clean sweep....browse on the bottom right....find your file or folder...then open and then wipe.....check it out and if its not installed ....you might put your norton disk bac in and check and see if you got it....most people don;t even know it is there....and as long as you install norton the typcial way you dont get it ,,,,but do a custom install then you do.....that is if you got the norton system works package....then you got clean sweep ...you just got to install and do a custom install....doing that you get a lot of extras you wouldnt have other wise....
did you ever check out that CClean ...you might try it and see what it might find....

http://www.ccleaner.com/

then couple guys over at after dawn swears by this for virus...you might want to turn norton off and install and just run it and see if it comes up with anything...you can always uninstall it after you run it .....something else do you have live update turned on with your norton.....???

http://free.grisoft.com/doc/2/lng/us/tpl/v5

like i said a couple of the techy guys that are on after dawn says this pretty good free virus software.....

take care love and ebnjoy your trip

just an old highway tramp
---Bill---