It never updates. It used to auto update as soon as I started the PC & connected to the net. Now I have to manually update it.
Which are your Update (Basic) settings?
Do you use a proxy application (annonimizer)? Can you set your avast to use NO proxy at all if you don't use one.
Make sure your browser is not set to "Work Offline" (this option is generally in the File menu). If it doesn't help, try switching the proxy settings from "Auto-detect" to "No proxy" (I'm assuming you're not connecting to the Internet via proxy).
Left click the avast icon > Settings
Update (Basic) > Details > Proxy
Which is the error message? No error msgs.
Nothing? And what about the Log viewer and the setup.log file into the <avast>\data\setup folder?
Which firewall do you use? Comodo. Im wondering if this is the problem actually. Cant see any attempts to connect to the net by avast blocked though?
Most probably this IS the problem...
avast.setup must ask or be allowed to connect the Internet and donwload the update.