Or you just copy avast log viewer information or you just did not take enough lines.
Can you open the log into Notepad, go to the end of it, and copy the latest 250 lines of it?
I can't help if I don't know what's wrong with your computer.
Anyway, I suggest an installation from the scratch:
1. Uninstall avast from Control Panel first.
2. Boot.
3. Use
Avast Uninstall for complete uninstallation.
4. Boot.
5. Install again the last version.
6. Boot.
7. Check and post the results.