Dear all,
I while back I posted this: http://forum.avast.com/index.php?topic=121403
Please read this to see all the troubleshooting steps I have already taken.
It seems that everything was OK. However, I hardly ever reboot my machine, preferring to just use hibernate. Today I finally rebooted, after which Avast again says Not Yet Registered at the top of the program, yet in the Registration section, it says Registered 0 days remaining.
When I try to register, I now get a slightly different error to when I posted the previous topic. I fill in the registration form, click Register, and then instantly get: Error 0x80046401
Any ideas?