Problem with Norton

I have a friend who had Norton Anti Virus installed on an imac, the mac now wont go on the web and I think it is something to do with the firewall.
I cant change the Apple firewall settings as it says there is another firewall in use, Norton wont re-install to allow the settings to be changed and the remaining files scattered around the hard drive wont delete because it says they are in use.

Any ideas on how to delete a file which is still in use or how to force it to not be in use?

Ive tried appzapper but it looks like you need the application there to do it, all that is left is a few files.

I have read nothing good about the current Norton software and OS X. You maybe in the worst case scenario here (archive and install). Hopefully some one will come and have a better answer.

You could try doing a Spotlight search for Norton and Symantec and getting rid of the files manually.

I think there might be a Norton uninstaller available at the Symantec website. You might want to look into that.

I've gone down the spotlight route and it wont delete the files because it says they are in use.
I cant change the settings because it wont let us reinstall the program
I have prepped them into back up mode as I think it may be the only way out, just wanted to see if I had missed anything obvious

There should be an uninstaller on the original software CD. If that does not work you will have to go to the web site and download the latest uninstaller.

Here is one lin to Versiontracker to get you started:-

http://www.versiontracker.com/dyn/moreinfo/macosx/22098&mode=feedback