Problem with some PC's on domain updating VPS

[Chrisgr85]

We have a problem on a network where certain PC's are not updating the VPS automatically.

Error message below. It seems that it is Windows XP SP3 machines, although there is one Windows 7 machine also listed with the error. Other machines (including other XP SP3 machines!) are updating perfectly fine.

Error message: Function setifaceUpdatePackages() has failed. Return code is 0x20000006, dwRes is 20000006. 

Any ideas on what the problem could be?

ADNM v4.8.995

[.: Mac :.]

Have you tried forcing the update from one of the clients?

[Chrisgr85]

Hi Mac, thanks for the reply. I have tried pushing it out from the server and also connecting to the client PC and running the Avast UI and updating from there, but no luck.

I did a complete reinstall of Avast on the users machine, but the problem remains.

[matthews]

I have been failing to update avasti 5 virus data base. What could be the problem?