SAM Error Event ID 12294 in system event in Windows 2003 Domain Controller

Hello friends,
I am getting an contineuos error of SAM account in system event. Event ID is 12294. I removed the virus WORM_NYXEM.E but still i am getting same error every second. Description is as geven below…
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.
Please Help
Thanks in advance

Satish S. Maurya