I'm not an expert or anything, but maybe i can help you until one comes along. it looks from these 2 entries:
O34 - HKLM BootExecute: (autocheck autochk *) - File not found
O34 - HKLM BootExecute: (aswBoot.exe /A:"*" /L:"English" /RA:delete /archives /KBD:6) - C:\WINDOWS\System32\aswBoot.exe (ALWIL Software)
like bootscan is only scanning your A: drive(floppy). try scheduling another bootscan , but this time select your C: drive
maaaaybe this will help, I hope so. if this doesn't work, you may try to repair Avast! by uninstalling it through add/remove programs and selecting "repair"