A way to delete Norton/ Symantec Antivirus. To date I haven't tried this product yet, but tomorrow will see it in use.
On previous occasions I've used MSIZap.exe ;
I've generally used this in conjunction with the registry cleaning instructions from Symantec to remove their product;
I have found on occasions thought that unfortunately sometimes the best thing to do is copy out the user data and re-install the OS, if you spend more than 3 hours trying to fix a client machine, you better have a good reason to want to keep it.