Intellisense stops working in Visual Studio 2008.

Try to close Visual Studio, delete the hidden .suo file (at the same directory as the .sln file --often in userName/Documents/Visual Studio 2008/Projects/projectName) and restart Visual Studio.

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Failed to access IIS metabase

You may have installed IIS after installing the .NET framework.  If that's the case, try running to repair your ASP.NET installation and set up all of the appropriate ISAPI extension mappings.

aspnet_regiis -i