Symantec's products add/modify hundreds (or thousands) of registry
keys/values and removing them all manually is impossible unless you trace
the installation using a snapshot tool. If you want to remove the program,
first, try uninstalling
the program via Add/Remove Programs. If that does not help, look for the
uninstaller tool available at Symantec's site for that particular product
which you intend to remove.
Note that uninstaller utility may not be available for all the products, but
Symantec provides REG files for removing some products. Go to:
for more information.
BTW, the Services entries are present in this registry location. One or more
of the sub-keys may be related Norton products. You should be able to
identify them easily by reading the "DisplayName" and "ImagePath" fields in
the right-pane in the Registry Editor.