I need to update a legacy Web App using Telerik RadControls for ASP.NET Q3 2007, I have later versions Q3 2009, Q1 2010 and Q2 2010 also installed, I get an exception on installing Q3 2007, 'Error creating virtual directories, Exception details: Unknown Error(0x80005000). Has anyone else experienced this problem and found a workaround? I am using VS2008, I also have VS2010 installed. I have tried uninstalling the later versions first, but installation of Q3 2007 still fails.