system
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Hi ibdemon, welcome to the forum 
The boot time scan log can be found in the "scan computer section → “Scan Logs” in avast.
However the better option would be to look here:
XP –> C:\Documents and Settings\All Users\Application Data\AVAST Software\Avast\report\aswBoot.txt
Vista/7 –>C:\ProgramData\AVAST Software\Avast\report\aswBoot.txt
You can copy and paste from there. If you want, the results could be posted here and someone could try and help if you need.
Scott
EDIT: Vlk, would it be possible to include a link in the scan logs to the corresponding text file? Otherwise the scan logs section is kinda pointless…