If your computer has been off line for a week or more, perhaps you have been on holiday, then the antivirus will not have had the opportunity to update.  These instructions show you how to catch back up by initiating a manual update.

It is occasionally necessary to run a manual virus scan of your entire machine, for example if the machine has been running slower than usual.  Here we will show you the steps it takes to achieve this using AVG 9 as an example.