Error on Primary DC Windows Server 2003

Greetings:

We recently changed our domain admin password and ever since then i have been getting this message in the System log on the Primary DC:
Event Type: Error
Event Source: SAM
Event Category: None
Event ID: 12294
Date: 9/8/2004
Time: 12:11:02 PM
User: Administrator
Computer: AASDC3
Description:
The SAM database was unable to lockout the account of Administrator due to a resource error, such as a hard disk write failure (the specific error code is in the error data) . Accounts are locked after a certain number of bad passwords are provided so please consider resetting the password of the account mentioned above.
Data:
0000: a5 02 00 c0 ¥..À

Can anyone help me on this?