After being away from my computer for a couple of hours, I returned to find two pop-ups reading:
"AvastSvc.exe Error
The exception unknown software execption (0xc0000417) occurred in the application at location 0x7858ccd5"
and
"AvastSvc.exe Error
The exception unknown software execption (0xc0000417) occurred in the application at location 0x785569d0"
My background was black, the task bar was missing, and Windows Explorer (explorer.exe) was not responding. I had to power off and re-boot.
AvastSvc generated an error log, a unpXXXXX.temp.mdmp file, and multiple unpXXXXX.mdmp files.
I have made multiple attempts to upload a zipped folder of the error log and MDMP files to
ftp://ftp.avast.com/incoming. Each attempt has ended after about two hours (with two to three hours remaining) giving the message:
"An error occurred copying a file to the FTP Server. Make sure you have permission to put files on the server.
Details:
The operation timed out"
My system is running Avast 6.0.1367 on Windows XP/SP3.