Can not delete a folder on TFS source control by team explorer or by tf delete command

Question

Dear every body.

I have a problem with my TFS source control. There are some folder in TFS source control I can not delete or move. There 's error:
Error:

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Microsoft Visual Studio
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Error

A database error occurred (SQL error 18054) ---> Error 500031, severity 16, state 1 was raised, but no message with that error number was found in sys.messages. If error is larger than 50000, make sure the user-defined message is added using sp_addmessage.

Error 500022, severity 16, state 1 was raised, but no message with that error number was found in sys.messages. If error is larger than 50000, make sure the user-defined message is added using sp_addmessage.

I use TFS 2005 SP1,

Please help me solve this problem,

Thanks and best regards,