I recently had to build a new computer due to a hard drive failure. I'm trying to install several compilers and tool kits, it's a very bumpy road. I have several web site projects VS2010 using Infragistics products which are version "Infragistics45.Web.v15.2, Version=15.2.20152.2125". I can see that the .NET framework for 4.0 has been installed on my computer but when I try to install .NET framework 4.5 I get a message "Microsoft .NET Framework 4.5 is already part of this operating system". When I open the project and click "Start Options" and select "Build", it only shows .NET framework 4. How can I get 4.5 installed?