I have looked at the dumps. They are, unfortunately, "heap corruption" type of problems, which are technically impossible to properly analyse from such dumps.
However, if the problem is reproducible on your system, we may try to set up a "trap".
Download the gflags utility from pk's post, and use it like this (from the command line):
gflags -p /enable AvastSvc.exe /full
Then reboot the computer, and watch for the problem to occur again.
Thanks
Vlk