I am seeing bsod's caused by avast over a number of my xp pro installations, all are running avast internet security. Typically, it happens a few times a month, but sometimes a few times a week, and usually seems to happen when the user is browsing the internet with internet explorer, nothing fancy. Shutting down the machine and restarting it fixes it for a while. I can't make it happen intentionally. Memory tests come up clean. I scan the minidump file with microsoft crash file analyzer and it is "probably caused by" asw file.
I am using the most up to date version of avast. If I find out anything more I will post it, just letting you know what I am seeing. If you want I can submit minidump files.
-Jerry