Hi,
Please check the folloiwng articles.
Event ID 5719 is logged when you start a computer on a domain, and the computer is running Windows Server 2003, Windows XP, or Windows 2000
http://support.microsoft.com/kb/938449
Netlogon 5719 and the Disappearing Domain [Controller]
http://blogs.technet.com/b/instan/archive/2008/09/18/netlogon-5719-and-the-disappearing-domain.aspx
If the issue persists, please post an output of ipconfig /all from the affected computer.
Brent
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