Go to start/run type regedit hit enter.
when the window pops up
go to HKEY CURRENT USER/SOFTWARE (click the little plus sign next to the items)
Scroll down in this menu looking for Norton or Symantec folders.
DO NOT
touch anything until you post back here
I cannot stress this enough.
do the same search in HKEY LOCAL MACHINE looking for the same items. Leave the regedit window open while you post.