go to HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\EventLog:
Then add permissions to a specific account.
related link: http://blogs.objectsharp.com/cs/blogs/bruce/archive/2003/11/03/180.aspx
System.Diagnostics.EventLog eventLog = new System.Diagnostics.EventLog("Application");
eventLog.Source = "Rtws";