I started avast! antivirus from the tray, stop initial memory scan during AV load and got error 'The system can not open device or file specified' - 'Невозможно инициализировать хранение данных' (probably English translation is like 'Data storage initialization is impossible').
I can not find any record in the log corresponding to this error. To reproduce this error I can not too (I tried several times but everything worked ok)
System XP SP2, avast! 4.8.1185 Pro
P.S. Sorry, there are 4 similar error records in Event Viewer (Antivirus log)