TIBCO LogLogic Lasso Enterprise was installed and configured successfully and it fails to collect logs. In the Event Viewer Application journal you see the error: 

Event Type: Warning
Event Source: LogLogic Windows Event Collector
Event Category: None
Event ID: 2006
Date: 11/4/2009
Time: 7:42:46 PM
User: N/A
Computer: LL-LASSO
Description:
LogLogic Windows Event Log Provider encountered error while processing event logs.

The Lasso error is:
System.TypeInitializationException: The type initializer for 'LogLogic.WindowsEventLogProvider.WindowsEventLogProviderPerfmonCounter' threw an exception. ---> System.FormatException: Input string was not in a correct format.
at System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal)
at System.Number.ParseInt32(String s, NumberStyles style, NumberFormatInfo info)
at System.Int32.Parse(String s, IFormatProvider provider)
at System.Diagnostics.PerformanceCounterLib.GetStringTable(Boolean isHelp)
at System.Diagnostics.PerformanceCounterLib.get_NameTable()
at System.Diagnostics.PerformanceCounterLib.get_CategoryTable()
at System.Diagnostics.PerformanceCounterLib.CategoryExists(String machine, String category)
at System.Diagnostics.PerformanceCounterCategory.Exists(String categoryName, String machineName)
at System.Diagnostics.PerformanceCounterCategory.Exists(String categoryName)
at LogLogic.WindowsEventLogProvider.WindowsEventLogProviderPerfmonCounter.CreatePerfmonCounters(Boolean deleteExisting)
at LogLogic.WindowsEventLogProvider.WindowsEventLogProviderPerfmonCounter..cctor()
--- End of inner exception stack trace ---
at LogLogic.WindowsEventLogProvider.WindowsEventLogReader.GetEventLogs(UInt32& eventLogCount)
at LogLogic.WindowsEventLogProvider.WindowsEventLogReader.ReadEventLogsInternal()
at LogLogic.WindowsEventLogProvider.WindowsEventLogReader._ReadEventLogs()
at LogLogic.WindowsEventLogProvider.WindowsEventLogReader.ReadEventLogs()
at LogLogic.Core.Command.Invoke()
at LogLogic.Core.AsyncTask.InvokeNextCommand()

This indicates that performance counters are corrupt on the Windows Server on which Lasso Enterprise is installed and, as a result, they must be rebuilt.