You don't have this path on your sys?
C:\Documents and Settings\All Users\Application Data\
Gee... yours is well customised, then.
Your log is clean, and if there are no popups, well, may we say no problem exists now? To clean out Norton remnants [there is still a service trying to run..] do this:
Go start, run, type cmd and press Enter. Paste in these two lines pressing Enter after each, then close the window:
sc stop Norton AntiVirus Server
sc delete Norton AntiVirus Server
Do that even if you decide to reinstall Norton, in which case you must remove AVG Free.
.. I wonder if that was halting Panda's scan..? Do a search using "panda" as the search string in C:\ and delete the 4? components you find. If you retry the site then it may well work.