Machine.config error

Guys,<br><br>I keep getting a machine.config error. It is not consistent but keeps popping every once in a while. I am runnung the application on my WinXP development machine. <br><br>Any ideas?<br><br>Server Error in '/ElderHelpLine' Application.<br>--------------------------------------------------------------------------------<br><br>Configuration Error <br>Description: An error occurred during the processing of a configuration file required to service this request. Please review the specific error details below and modify your configuration file appropriately. <br><br>Parser Error Message: Access is denied: 'Microsoft.Web.UI.WebControls'.<br><br>Source Error: <br><br><br>Line 197: <add assembly="System.Drawing, Version=1.0.3300.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"/><br>Line 198: <add assembly="System.EnterpriseServices, Version=1.0.3300.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"/><br>Line 199: <add assembly="*"/><br>Line 200: </assemblies><br>Line 201:<br><br><br>Source File: c:windowsmicrosoft.netframeworkv1.0.3705Configmach ine.config Line: 199 <br><br><br>--------------------------------------------------------------------------------<br>Version Information: Microsoft .NET Framework Version:1.0.3705.288; ASP.NET Version:1.0.3705.288