Problem: 

Some Windows XP users experience the following warnings in the system event log:

Type: Warning
Source: ACPIEC
Category: None
Event ID: 3

Description: \Device\ACPIEC: The embedded controller (EC) hardware returned data when none was requested. This may indicate that the BIOS is incorrectly trying to access the EC without synchronizing with the OS. The data is being ignored.

Solution:

Please update the BIOS to version 123B.T01.