The last upgrade of AVG from 8.5 to 9 has many great changes while the best features remain unchanged. The newest AVG scans much faster and uses less resources, while the residential shield (which catches malware before it has a chance to infest your computer) still works well or even better than before. And the reliability and scheduling of the scans and updates makes it my first choice in a free anti-virus for my clients. However many clients get stuck when trying to update from free AVG 8.5 to 9.0.
This is what to do: Go to Start>Control Panel>Add and Remove Programs or on Vista or Windows 7 just “Programs”. Wait for Windows to form a list of installed programs. Find AVG in the list and uninstall it. Then reboot the computer. Now that 8.5 is removed, download and install version 9.0.