Vista - Unable to create an Event Log entry

I am attempting to make an event log entry, but get the following exception:

System.Security.SecurityException: The source was not found, but some or all
event logs could not be searched.

The code is:
if (!EventLog.SourceExists("VCS 2005 Recipes"))
{
EventLog.CreateEventSource("VCS 2005 Recipes", "Application");
}
EventLog.WriteEntry("VCS 2005 Recipes",
"A simple test event.",
EventLogEntryType.Information,
1,
0,
new byte[] { 10, 55, 200 }
);

Any help will be appreciated. TIA