You receive a "The event log file is corrupt" error
You receive a "The event log file is corrupt" error on a computer that is running Windows Server 2003 SP1, an x64-based version of Windows Server 2003, or Windows XP Professional x64 Edition:
http://support.microsoft.com/default.aspx?scid=kb;en-us;899416
We saw this little one rear it's head during one of the testings and the only way to fix it then was to swap nic cards..not exactly the greatest solution.
Looks like now they have a hotfix.
(Remember hotfixes can obtained for free with a call to Microsoft)