1022 error. Database Page Cache

Hi all, My problem is that I am getting 'MSExchangeDS (192) Buffer I/O thread termination error-1022 ocurred'and 'MSExchangeIS (261) Unexpected NT API error: OxC00000D' messages on Event log. Windows NT 4.0 Network and Exchange Server 5.5. Does anyone what is wrong or what the problem is?. Many thanks.
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MouseAuthor Commented:
Edited text of question.
MouseAuthor Commented:
Adjusted points to 50
Have you just installed a virus checker on the server?
You will have to remove it (disble it does not resolve) temporarily. then apply the post SP3 hotfixes even if you are at SP5 or 6 already.

Technet PSS ID Number: Q174746 refers to the problem.

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MouseAuthor Commented:
Thanks, you were right I had installed an antirirus recently. This time was enough re-booting the server.
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