Can you schedule a boot-time scanning?
Start avast! > Right click the skin > Schedule a boot-time scanning.
Select for scanning archives.
Boot.
Or just run:
C:\Program Files\ALWIL Software\Avast4\sched.exe /A:*
Access denied means, generally, that the file is in use by another process (program) and cannot be repaired/cleaned/moved/handled by avast!
The report file is created automatically in <avast4>\Data\Report\aswBoot.txt