On April 1st, (always ominous) AVG sent me an upgrade that succeeded in grinding my PC to a near halt and putting it into a shutdown sequence after about 10 mins. Sadly it takes about 15 unistall AVG which is kind of problematic. Anyway, I had a piece of software called 'shall I remove it' which performed the task quicker and beat AVG to the finishing line.
This left me now looking for a new AV. I tried Comodo but never got the impression that it worked as there was a compatibility issue with windows defender. I think this was probably the case that Microsoft didn't like Comodo myself, but without having the reassurance of a nice button saying 'everything is tickety boo' I decided the chances were that it wasn't 100% configured and functioning. This led me to the less aggressively named 'Panda', which despite its attempt to load Yahoo as a default was a really easy install and has speeded the PC up based on the previous performance under AVG.
CNET's review said Panda had the highest detection rates of the free AV's they tested so this is where I am at the moment. Sadly it didn't allow me to connect to the internet however when I came to log on from my first shut down and reboot, but uninstalling some add on that came with it seems to have solved that now, and the console is showing no signs that I've taken a level of protection out. I have to say that instinctively, this particularly tweak doesn't feel right so perhaps there are more issues on the way
I agree about Nortons, I'm still slightly surprised anyone uses it