I had the same issue with two PC's running Avast Free version 4 - one upgraded automatically to version 5 the other (even when I asked it to upgrade engine) stayed at 4.
You did uninstall version 4 completely with a re-boot before installing version 5?
To be honest, for PC's capable of easily running Vista or Windows 7 I now use Microsoft's free Security Essentials.
Last edited by: Victorbox on Wed 2 Jun 10 at 09:48
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