I'm running Avast free antivirus with Windows XP Pro and SP2. Yesterday a popup told me there was a new version of Avast available, so I downloaded it. This morning I noticed that there was a red warning circle, so I clicked on the icon and up popped a warning message "Avast: The AAVM subsystem detected a RPC error". I checked that Avast and Remote Procedure Call were enabled in services. I uninstalled and reinstalled a fresh copy of Avast, but the error was still there. I again uninstalled Avast and reinstalled the previous version of Avast (version 4.1) and all is well again. Am I the only one on this forum to have this problem?
I just clicked on the "Update the virus database" flash and Avast installed the new version again, so another uninstall of version 4.5.523 and reinstall of version 4.1.418, and I'm free of errors again. I think this may be another ZoneAlarm scenario where certain versions are incompatible with certain installations.
Thanks to Diodorus Siculus, Belatucadrus, Tick Tock and hatrickj. After looking at the Avast forum, I downloaded Avast version 4.5.529 beta which apparently has fixed a number of bugs in version 4.5.523. All is now sorted :-))