These are the two entries I referred to above.
Event Type: Error
Event Source: avast!
Event Category: Client
Event ID: 90
Date: 04/11/2007
Time: 23:48:29
User: N/A
Computer: XXXXXXXXXX
Description:
AAVM - scanning error: x_AavmCheckFileDirectEx: avfilesScanReal of C:\Documents and Settings\Owner\Local Settings\History\History.IE5\MSHist012007110420071105\index.dat failed, 0000001E.
Event Type: Warning
Event Source: avast!
Event Category: Client
Event ID: 90
Date: 04/11/2007
Time: 23:48:29
User: N/A
Computer: XXXXXXXXXX
Description:
AAVM - scanning warning: x_AavmCheckFileDirectEx [UNI]: C:\Documents and Settings\Owner\Local Settings\History\History.IE5\MSHist012007110420071105\index.dat (C:\Documents and Settings\Owner\Local Settings\History\History.IE5\MSHist012007110420071105\index.dat) returning error, 0000001E.