Norton is absolute crap. we run it on our work machines, and I have often had to do the following:
Go to free-av.com and download anti-vir, but donot install it yet.
start spybot search and destroy. go to advanced mode, then tools and startup.
uncheck all the norton startup stuff. don;t delete it as you need to have it.
Next, go to control panel.
Computer management
services.
find the norton/symantec entries and disable them. (right click, properties ther is a pulldown box, it is likely set to auto, set to disable) You may want to note which ones, so you can re-enable them when done.
after that, reboot.
nortotn should not be running.
install anti-vir.
Carefully note the full name of the directory it is in.
let it do it's update. and run the scan.
let it remove everything it finds.
in the options setting, there are options for removing win32 malicious software, turn that on to medium setting, and rescan.
you didn;t mention the os version, but on any xp, reboot and hit f8 and go into safe mode command prompt.
cd to the directory you installed anti-vir to.
run avcenter.exe, it will open the control center , and rerun the scan.
remove anything it finds.
if it needs rebooting to remove anything, do it.
when it is clean, boot normally and use add/remove programs to uninstall antivir.
re-enable the startup stuff with spybot, go back to services and re-enable norton/symantec services.
if it's still there, you are likely root kitted. format cL and start over. it will be faster.
for the help