i got this error message in the event log, the error message is: Event Type: Error
Event Source: avast!
Event Category: Client
Event ID: 90
Date: 9/8/2004
Time: 6:42:38 PM
User: NT AUTHORITY\SYSTEM
Description:
AAVM - scanning error: x_AavmCheckBootDirectEx: avscanScanReal of *BOOTA failed, 00000005.
what caused this, any ideas?
Have a look at THIS thread.
Eddy: wrong link. 
Charro Greg, BOOTA is related to the boot sector of disk A. When you start an on-demand scanning of all system the diskette was not on the drive, so this is the error. Maybe a ‘full’ system scan… Not much to worry 