system
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I suffered from the same problem. Here’s my OTL log.
As you may see, avast was the only application I’d installed on my XP besides security updates and device drivers. In fact, I ran the installer right after os was setup properly.
I’ve tried simliar thing on another computer, using a different copy of XP setup disc. It was not alright yet, there was no “unprotected” warning, but neither engine/vps nor the program could be updated, the progress bar would stick at the very begining. Only streamline update seemed working.
So I think the cause of this problem may not be something conflicting, but something missing or mismatching.
I now use version 8, but the update problem still exists. I wonder if I encounted a bug of the avast installer.