I tried to install MSCharts on my Win2008 server. It installed without problem. Then I wrote in config.
But when I\'m trying to open page with charts it returned
Don't know anything about MSCharts, but I'd say try changing the AppPool for the app to 'Classic .NET AppPool'.
Alternatively, you may need to modify your web.config to add the handler in there. See Rick Strahl's post here.