WMI WRITER error issue

We are using Symantec Backup Exec 11.0 d for doing backups and for the last two weeks , we are getting job failed status with  following message :
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AOFO: Initialization failure on: "\\EXCHANGE\Shadow?Copy?Components". Advanced Open File Option used: Microsoft Volume Shadow Copy Service (VSS).
Snapshot provider error (0xE000FED1): A failure occurred querying the Writer status.

Check the Windows Event Viewer for details.

Writer Name: Windows Management Instrumentation, Writer ID: {A6AD56C2-B509-4E6C-BB19-49D8F43532F0}, Last error: The VSS Writer failed, but the operation can be retried (0x800423f3), State: Failed during freeze operation (9).
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This is for our MS Exchange Server 2003 and when I run VSSADMIN LIST WRITERS command,
I get the 'RETRYABLE ERROR ' message for WMI WRITER  with state 'FAILED'. However, rest all of the writers show state 'STABLE' a nd 'NO ERROR'
We have all recent updates and have also installed 'KB943460' to fix VSS snap shot issues.
mn210Asked:
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mn210Author Commented:
Also, I checked Even Viewer on Exchange  and I am getting application log of information type :
Event ID : 907  Source : ESE BACKUP
Information Store [852] Backup data transfer method is shared memory [64kb].
This message has stared showing up for the last ten days.
I have already rebooted Exchange twice and Media Server as well.
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honmapogCommented:
Do you mean you installed KB940349? If not, do install it. KB943460 seems to be unrelated.

Try backing up WMI as described in http://technet2.microsoft.com/windowsserver/en/library/872a660b-391b-486c-a0a8-daa6acfa0aaa1033.mspx?mfr=true - does this work?

Try rebuilding the WMI database as per part 3 of http://seer.entsupport.symantec.com/docs/276742.htm
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mn210Author Commented:
I am sorry ! I did install KB940349 and NOT KB943460.
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