system
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Just a FYI as the problem was solved.
I had the Software Updater disabled, going into the appropriate screen I was not able to turn it back on by clicking the button top right (as per attachment), it was unresponsive. Yes I tried running a repair.
I had to go into settings> tools> software updater and succeeded from there.
Thanks to you my mate for showing me how to do this. I have posted 2 support tickets with Avast within 6 days asking to re-enable software updater and not had one single response. Dreadful service. Wish I had come here first. Cheer - Graham.