I use the free version, don't know about you, so I'd just download a fresh copy unless you have an install disc which you could use. You might have to do an uninstall via the Programs & Features applet of the Control Panel first. When you get it working, I'd boot to Safe Mode and do a full system scan for viruses & malware.
Just checked AVG activity and it says there are no active components. Computer, web browser, identity and emails all marked unknown... Also said update failed and connection offline. Tried updating new version from CNET alert email and message came back the line was broken....
Anyone around who can help me???