nrfw: Can you please try to following?
1. Disable avast! self-defense (Settings / Troubleshooting)
2. Stop avast! Behavior Shield
3. Start the scan again and wait until it gets stuck
4. Open Task Manager, on the Processes tab select AvastSvc.exe, rightclick on it and select "Create dump file".
5. Wait for the dump creation to be finished (i.e. till the Cancel button turns into OK). You'll see the location where the dump was created, and you can copy&paste that test.
6. Rename this file to something unique, or compress it into a uniquely named archive, and upload it to
ftp://ftp.avast.com/incomingThanks!