Microsoft .NET Framework

After the Automatic Updates on 7-10-07, a box showed up that at the top showed ‘Microsoft .NET Framework. Stated ‘An unhandled exception has occurred in a componet in your application. Click continue and application will ignore this error and attempt to continue. Object reference not set to an instance of an object.” I clicked continue but no sucess. In Details it stated that JIT Debugging must be enabled. HELP!! How do you enable JIT Debugging.