1400 - invalid window handle

I have written a program and installed at a server, with 5 workstations connect to that program and database located at that server.  4 workstations are working fine, BUT there is one workstation keeps encountering this error "1400 - invalid window handle" when trying to open up any screen in that program.

Please help or advise if you have any idea on this kind of situation.
ivylnmAsked:
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sun4sundayConnect With a Mentor Commented:
If only one work station gives problem windows update may be the problem
System Error Code: 1400 Invalid window handle
Background: Microsoft recently released a non-critical, optional update for Internet Explorer 6 for Microsoft Windows XP Service Pack 2 and Windows Server 2003 Service Pack 1. This update changes how Internet Explorer handles web pages that use ActiveX controls. As a result, the MathXL Player generates the error shown above.

You may have to uninstall the Update for Windows XP (KB912945)

For more details check here

http://www.there.co.za/Source-Code-114RdR23X2q1

sun4sunday
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