Windows XP SP3 Professional
avast! free - latest version (sorry after last update don't have access to avast! interface so can't get you version or virus definition)
AVG Free - uninstalled
Just did an update using the avast! interface. (I've only been using avast! for a week or so, I registered it after installation).
It appeared to install OK and I did reboot as recommended. When it restarted it came up with the following error "failed to init aswData.dll.
I now cannot access avast! and the little icon on the bottom right of the screen has disappeared.
Any help would be appreciated.