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Event ID: 1 Source: AVDiagnostics

The description for Event ID ( 1 ) in Source ( AVDiagnostics ) cannot be found. The local computer may not have the necessary registry information or message DLL files to display messages from a remote computer. You may be able to use the /AUXSOURCE= flag to retrieve this description; see Help and Support for details. The following information is part of the event: .
Caused by Trend Micro. Access from a machine that has Trend Micro installed and you might get something similar to below -
P00000900 T000008c8 RXI32 L02 Z0000000039 10\21\2009 10:31:06.899 rxi32.cpp : Line  746 : RmiSesOpenEx FAILED.

Unfortunately I don't know what this means but this is a start.
From a post on Experts-Exchange they came up with this solution:

Turns out the NEC ViewMail program has a diagnostics section.  By turning off all diagnostics, the errors will go away.  According to NEC rep, diagnostics are only needed if there is a problem.  If no issues exist, the diags can be turned off.

We have the program installed on our systems too but I have not yet tried this solution.

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